'Choose Signature'

Are they assigned to the email account you are using?

When you create them, they show up under All Signatures.

You have to drag the signature from the All Signatures list onto the accounts you want to use it with.

If you select an account, then Add a signature, it will be assigned to that account.

So happy to have found this! Why in the world does this not show as a '+' under signatures? This was so so easy after I found out to drag and drop from ALL SIGNATURES! Thank you!