Customize footer credits & copyright
The footer credits and copyright can be edited or removed in the Theme Functions file at WordPress > Appearance > Editor > Functions.php. Make sure you have access to the File Manager before attempting to make any edits to the Functions.php file.
There is some variance between themes (re: what is displayed in the footer area), but in general you'll look for a section in the Functions.php file that looks like this:
Please note that while you're welcome to remove the 17th Avenue footer credit, doing so will void access to theme support. See our support policy.