Remove Watermark from non-free plugin not hosted on wordpress.org

I’m trying to remove the watermark on this plugin

https://www.wonderplugin.com/wordpress-tabs/

I’ve look around in the editor but have no clue where to discard it. Could someone help me resolve this, or maybe I could code something in the custom css?

• This topic was modified 9 years, 7 months ago by Jan Dembowski.