What is the Fn key? I don’t have a key that says Fn

DebraKayLee wrote:

What or where is the Fn key?

If you have a Globe key, that is the same as Fn.

Fn = "Function". Not all KBs have an Fn key.

You question can't be definitively answered without knowing the specific KB you're using.

Please read Use keyboard function keys on Mac - Apple Support:

"The top row of keys on an Apple keyboard are called function keys."