301 redirects in Headway based WordPress Site

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First of all, Headway is not the issue, if Headway itself doesn’t deal with any kind of 301 redirect.

And answer to the question is:
After having the folder in action if you change the “WordPress Address (URL)” and “Site Address (URL)” in your /wp-admin/options-general.php (Admin » Settings » General) to the new address like:

http://example.com/blog/

Then the whole site will work with the new URL. (After the change you will just need to reenter the admin panel once – and that’s all)

So, the first issue is solved.

But there could be an underlying issue with hard-coded inner links used in a blog. Suppose you linked one of your post with a simple text link (<a href="http://example.com/blog-post-name-1">My blog post 1</a>) — after the folder URL such links will generate 404, and that will be the problem. A similar issue is cited in one of my Question:

So in that case you will need a .htaccess 301 redirection. But most of us are not so expert about .htaccess, so there are some plugins, can help us in our way.

Yoast have a good URL redirection plugin that can assist you in achieving this. And there are more on this category:

With your input they will write .htaccess with right codes on your behalf.