When I click the set up 2FA thing in the account settings I then see the following
That button contains a link with a secret key, and some other things. What am I supposed to do with it? I want to set the 2FA up to use my authenticator on my phone.
the way 2fa works is that there is a “seed”, the secret key that you mentioned. this is what will be creating the timed codes. in most applications this will be converted to a qr code for ease but you can still import it to your app of choice or use an extension to convert it to a qr code like @wigglingwalrus@lemm.ee said
if you are interested here is a good video about it