In addition to the standard and free add-ons, choosing one of the paid Debutify plans gives you access to premium add-ons. In Debutify 5.0, you can use the Remove Debutify Branding add-on to Remove "Powered by Debutify" at the bottom of all your store pages.
How to Remove "Powered by Debutify"
In Shopify admin, under Online Store, click on Themes.
Select a Debutify theme (version 5.0 or later) and click on Customize.
Click on the Theme Settings Icon.
Click on Debutify Premium Add-Ons.
Select Remove Debutify Branding
Click Save to apply the changes.