Board Thread:Support Requests - Designing Your Wikia/@comment-25523075-20150521141928/@comment-5939974-20150702093233

You'll have to go to Special:AllMessages and edit the text for the specific use. Click the red hyperlink on the left of the text you want to edit, then edit it as if it were a normal Wikia article. If I were you, I'd leave the search field empty, change items per page to 5,000 and hit Go to see them all. There are actually 2 'post comment' buttons.

The one you want is titled article-comments-post, whereas the same button for blogs only is blog-comment-post.