We’ve previously discussed and shown you how to assign category to new blog posts. Now, we will show you how to assign category to an existing blog posts.
First you need go to Posts -> All Posts.
Once there, you’ll see list of existing blog posts.
Click on Edit Post as seen in the screen shot above.
After you click there, you’ll get an quick edit option box.
Choose the category you want to assign to your existing blog post. You can choose multiple categories as well.
At the end, don’t forget to click on save after you finish assigning category to your blog post.