Detect a button click with WWWForm.AddField?

Hi, i'm trying to find out how to detect a button click with WWWForm.AddField, but i can't seem to find a way.

I want to detect it because i want it to detect the click in a PHP script i made(I already made the PHP script, so i don't need help with any PHP, only the WWWForm.AddField), but how would i do it?

If i should explain better what i want, i will try.

EDIT: Nevermind, i know how now