New quick simple question

Hey guys I am new, and I’m on a laptop, more specifically a macbook and I have no idea what the “use” key is. could I have a little help please? Thank you for your time and patience.

The default key is “e” but if it is not true then go to options>keyboard and look under COMBAT, you should see “Use Item”
Hoped that helped :3

E is the normal key for use.

Ahh! Thank you guys. I really appreciate the help! it works