I can’t give a try using the WordPress editor, the problem is that if i create any syntax error I won’t be able to correct it since the admin would become unaccessible. The ftp is only to be able to revert the changes if something goes wrong, but if this isn’t in production yet that’s isn’t so much problematic.
Let me know if I can try using the WP Editor. Can you install the Uplift Child theme that we provide in the Themeforest Downloaded files so I can try the modifications inside the functions.php of the child theme?
-Rui