The layouts for the categories and the footer can be edited in the Divi Library. You do not need to load these layouts into any page or post, as they have been coded into the php files, but you can edit the details on the layout itself.
Category Set Up:
We have set the categories to the ones as shown on the demo:
If these are the categories, you wish to use, then leave them as is.
Should you wish to change them, do the following:
Create your categories in the WordPress post admin area.
In your download folder, you will find the following php files: (for example)
Rename the php file from for eg: category-beauty.php to category-YOURCATEGORYGOESHERE.php.
So if you want to change the category name to something like ‘books’, then file name should be category-books.php
The name of the category slug must be exactly as you have named it when creating your categories in the WP category admin area.
Upload via FTP to your child theme folder (see the following path)
WP Content >> Themes >> Engage Child theme folder
You can edit the layout of the Category layout via the Divi Library to either full width or left hand sidebar and as per the Divi Documentation.
If you wish to add additional categories, please send me an email and I will create the php file for you.