How to Remove WPMU link in footer, with a Networked site

Looks like I’m back!

Alright so I set up a site on multi-network, and due to that fact, I am unable to access the Theme Editor as best as I can tell from the Dashboard. Is there a way I can remove the WPMU link in the footer and how do I go about that? I’m using the Holder theme for now till I am ready to get the theme I want to use for the site.