Hotthemes copyright

Sorry guys, but this is the first time I use your templates... Neverteheless I have been using a lot from your competitors.
I want to delete "Joomla templates by HotThemes." on Academy template. How can I do that?

Despite the fact that you say that we are allowed to do it, I do not see any option for that...
Then I suppose I have to check the php files?
Which one?

Many thanks in advance.

In:

templates\hot_academy\library\c.php