How to use the f12 function to manually backtest from a mac?

 

I want to start trading a new system and since i am new i would like to backtest it. the problem is that i have a mac and i cannot seem to get the f12 function to work. I have tried changing my mac preferences to activate the functions but it only shows my dashboard when i press f12

Has anybody overcame this problem? how?

I really appreciate the help.