I am using this theme: http://www.eleventhemes.com/gridly/
In order for the pages to only show certain posts on certain pages it requires the category folder in front of the slug so if I have a page called graphic-design it has to be accessed this way: domain.com/category/graphic-design. When I go to edit the page in WP it automatically removes the / after the word category.
How can I add a folder name in front of the page name?