How to Add Custom Boxes to the WordPress Post Edit Screen

1. Log in to your WordPress dashboard. Click the 'Posts' link to create a new post or edit an existing one.
2. Click the 'Screen Options' tab at the top of the page. Click the 'Custom Fields' box to add a check to it, and then click the 'Screen Options' tab again to close it.

3. Scroll down to the 'Custom Fields' area of the page. Click the blue 'Enter New' link.
4. Click inside the 'Name' field and type a description for the custom field. For example, you might create a field called 'Location' if you travel and want to add a custom box describing the place where you created the blog post.
5. Click inside the 'Value' field and type the information that the custom field should display.
6. Click the 'Add Custom Field' button to add the field to your blog post.