by Jim » Mon May 10, 2010 2:35 pm
It depends on what template you are using if that tag is used or not. This may be coming from the Commerce Setup > Order System > Thank You > Information on the "Thank You screen to return to storefront: " field. The place for assigning the button if the tag uses it is Preferences > Store Text > Checkout > Return to Store: .
There may also be some templates that have the image hard coded so that it matches the rest of the theme.