How to change the post form from plugin?

If you want to change/add something to post form, you have to deal with meta boxes. I would recommend you to read through these articles:

Related Posts:

  1. Manually set global $post vars with an ID, in order to use template tags
  2. Show a different number of posts per page depending on context (e.g., homepage, search, archive)
  3. How to prevent a post from being deleted?
  4. How to Add jQuery Infinite Scroll to My Custom Archive Page
  5. How To Ignore a Filter On Applying Filter the Content In a Function
  6. publish_post hook isn’t working for scheduled posts
  7. How to get posts by content?
  8. Plugin for changing a post’s category based on it’s post date?
  9. WP get_permalink Return Wrong URL
  10. Edit/revise option for authors to suggest improvement to posts [closed]
  11. post expire after x days
  12. Action on post publish
  13. [Plugin: Posts 2 Posts] How does it work?
  14. Set attached to state
  15. Use plugin or custom post type for game score functionality
  16. How to add new tabs in post.php
  17. Bulk Image Uploader to create new post from each image [closed]
  18. Display comments of users on single page
  19. Using the “Latest posts” feature on a different site
  20. Post query – show posts from specified day and month and whole years
  21. Is there a way to order posts and custom post types as one group?
  22. How can i list random post from multiple category?
  23. Support for simultaneous editing
  24. Accessing post’s meta data based on user’s click of a post
  25. View Private Published Page with URL Code (no login required)
  26. Solutions to repost categories into multisite blogs?
  27. Is there an easy way to flag posts in the admin area?
  28. finding whether request is for post, and post id
  29. Display post lists in 2nd paragraph
  30. Preg Match All doesn’t Allow echo first character for WordPress Taxonomy Tags
  31. How to allow an editor to edit all WordPress blog posts but have the last say as administrator?
  32. Excerpts on category page
  33. Trying to fix form resubmition with PRG (Getting error: Cannot modify header information – headers already sent by)
  34. Display wordpress post’s in popup?
  35. Unable to add TAB character to post?
  36. AJAX fileupload – TypeError: not a function ajaxSubmit()
  37. Recent posts per category loop?
  38. ‘Organize Series Plugin’ as muti author feature
  39. Problem of encoding characters (apostrophes) in my posts publications
  40. How to backup single post in wordpress [closed]
  41. Is there a way to make the main page only display a brief description of the full article?
  42. WordPress plugin Post Creation [closed]
  43. posts from multiple post types in one slider
  44. How to display the featured post on the category page?
  45. Flickering sidebar when scrolling page [closed]
  46. Where Should i write the code for wordpress ajax voting?
  47. how to execute some code after a post is published in WordPress [duplicate]
  48. Post status doesn’t update to ‘future’ every time?
  49. trigger email when post is published by someone a user follows
  50. Grab ID from post from plugin and use it to create an object
  51. WP::is_main_query() Not Working
  52. Embed PDF into wordpress
  53. Hook Scripts and Styles in WordPress
  54. WordPress plugin: Getting posts where checkbox selected
  55. How to auto strip hyperlinks & images in wordpress post
  56. WP Editor, save content and category on frontend
  57. Plugin for TinyMCE to create reference to other posts
  58. How to get Recent Post From Each Category with Thumbnail?
  59. help intercepting save_post through plugin
  60. Why the internal link get converted into a comment?
  61. Copy/paste local images not working in WordPress
  62. how to move a plugin-block in Edit Post page back to bottom area?
  63. How to change my 3000 Published post status to Draft using PHPMyAdmin
  64. .com creates automated link in post
  65. Is it possible to customize a wordpress post from outside dashboard(Something like site.com/post-type/post/?e=post_id)?
  66. How to echo a PHP Code After the Content
  67. All Post WordPress Page Error
  68. Is it possible to create duplicate post on other site (either push, on publish, or pull, periodically)?
  69. WordPress CPT Url metabox collection
  70. Identify if the_post hook is being called from the admin post list
  71. Add dynamic color to each category item
  72. Is there any hook to change media html in post? [duplicate]
  73. Displaying friend’s posts only
  74. Publish Post but don’t call publish hook in foreground post creation
  75. Hidden Some Setting on Post or Page [duplicate]
  76. Better code/text editing for posts and pages?
  77. WordPress list child pages of custom post type
  78. Style WordPress Custom Post Type Single Page
  79. SWF in wordpress post
  80. get post excerpt by query
  81. Posts are deleted everyday at night
  82. Enforce conditions only for draft posts using WyPiekacz, ignore pending and published posts
  83. Using Postmash plugin in WordPress 3.3.1
  84. What is the correct method for updating post content from a plugin?
  85. Get post id in Post Page within Wp-admin
  86. PHP $_session is not work in wordpress
  87. Embedding BitBucket Code in Posting
  88. Next and Previous Pagination button not displaying in WordPress
  89. Notifications on WordPress Website [closed]
  90. Sell “create a post”, paid account for post creation
  91. Shortcode returning specific content of a post
  92. Looking for membership style plugin with edit option [closed]
  93. Change from blogger to wordpress
  94. How to customized post slider layout in elementor wordpress [closed]
  95. How to export post tags from wordpress
  96. Show WooCommerce products based on query parameters on redirect
  97. Getting 400 Error in wordpress website
  98. is_singular() in mu-plugins not working
  99. WP galleries in posts after import. How do I do it?
  100. How to check if the post exists in any of the categories?