Website Footer Powered By....

Hello, i can't seem to find the plugin or area as to customize the footer of the the website. Its currently displaying "Proudly powered by WordPress

I like to change it and as well when adding additional sites, would like my customers to be able to modify it as well.

I currently installed the plugin "Ultimate Branding" and i did change the Global foot and dashboard footer content. But I can't seem to find where i need to go to customize the website default footer text?

Please help.