Remove "Theme: Catch Box Pro" from footer

Hi, I have “Catch Box Pro” and I want to remove in the footer “Theme: Catch Box Pro”. What do I exactly have to do? I see coding and do not know what to add/remove. The reason to buy the Pro theme was the possibility to get it free from label. Now I am a little disappointed because I thought it was a matter of a button or something similar to change the footer design. Thanks.