I have recently got a mac an am not used to developing on a mac at all.
I have MAMP Pro 1.9.6.1. I did a locate on php.ini
and got this:
I don't know if you ever found an answer to this but I DIDN'T need MAMP PRO to do this. Simply goto the correct path by following what others have said. It's something like...
MAMP-> bin-> php-> php(your php version)-> conf-> php.ini
The key here is where you're editing the file. I was making the mistake of editing the commented part of the ini file. You actually have to scroll down to LINE #472 where it says "display_errors = Off and change it to On. Hope this helps any