Before doing this, make a copy of your footer.php file...just in case something goes wacky. (wp-content-->themes-->accelerate-->footer.php)
Go to the theme editor, Appearance-->Editor and look for the footer.php file . Open that. Find a code similar to this
`<?php do_action( 'accelerate_credits' ); ?> (or something like that)
Delete it. Bear in mind that deleting it will also delete your own copyright. I just added mine in the regular footer,so no big deal. BellaBellaHandmade.com
However....anytime ThemeGrill updates the theme, you'll have to do it again...
I'm thinking there is a way to upload a copy or something like it of the footer.php file into a child theme of accelerate, but I am not sure how to do that. The above is a temporary fix. Until I learn better. Hope this helps.