@matthew425
In this particular case, the file you will need to edit is in this path:
/wp-content/themes/evolve/library/functions.php
Look for the obvious plain text items starting on line 206 in that functions.php file. Don’t confuse it with the functions.php file in the root of the theme folder. There are two of them in this theme.
Because the file you need to edit is located in a directory within the theme directory itself, you will not be able to access it with the built in wordpress editor. The editor is not capable of browsing directories. You can edit it locally and then upload it, or use an ftp client or the file manager in your hosts control panel to edit the file “live” and then save the changes. Don’t forget to make a backup copy first, just in case you need to replace it and start over if something doesn’t go quite right.