Go to Appearance » Menus and add a custom link to your menu. This custom link is the link to your custom post type. If you are using SEO friendly permalinks then your CPT’s URL will most likely be something like this:
If you are not using SEO friendly permalinks, then your custom post type URL will be something like this:
http://example.com/?post_type=movies
Make sure that your permalink structure matches up to the URL you are entering to try to get to the custom post page and check to make sure that your .htaccess file is writable, if not, you will have to insert the rewrite rules generated by wordpess on your own.