F4 on Mac won't work for Absolute Reference

Hello!!

Im new so please be patient

I've just started an Accounts course and have to use Excel. We are being taught on PC's at college but at home and in the office we use Macs.

My first, probably of many questions, is f4 on Mac doesn't put the absolute function on. Is there another shortcut key I can use. hold something as I press something else type thing.

Any help greatfully appreciated.

Suzee xx