How do I remove "Powered by Wordpress"

I was trying to use the Ultimate Branding plugin to remove the "Powered by WordPress" in the footer of every page of my sites. I tried using the Global Footer tab, but that just adds a new footer underneath the offending footer. Then I tried the Text Change tab and still no luck. The whole string I am trying to remove is "Designed by Elegant Themes | Powered by WordPress" because I use Elegant Themes for most of my sites. Elegant themes actually has this text in the footer.php of every theme. I could create a bunch of child themes, but I was trying to save myself a lot of work using this plugin. Can it be done?
I'd be happy to just remove it and rely on Global Footer to put in my own text.