I accept legal terms

Hi
In Europe is mandatory the button "I accept legal terms" (check button ) in the GK contact form. Can you help? thank you very much

Hi,
Hmm I life in EU, and I didn't know about it, even government websites don't have it, like European Parliament contact form.
I suggest to use different contact module, right now I don't believe that we will add this option soon.
But of course you can edit plugin code manually and add one extra field with [] checkbox before [send] button.

Where is the file for edit the plugin manually?

Here: plugins\system\plg_gkcontact\plg_gkcontact.php