Talk:Debug Console Commands/@comment-73.38.88.224-20150803192048/@comment-26197572-20150804051834

This exact same question was answered on this page just a week ago.

"One some keyboards you need to hold a button and press the F3 key to actually use F3. My keyboard has an "Fn" key that I use to toggle between the functions (F1, F2, etc. ) and things like volume adjustment and screen brightness."