Logging into my Aternos account and accessing my server without Google/G-Mail?

Is there a way to log into my Aternos account without going through Google once I've already linked the Aternos account to my Google account? I'd like to be able to share the account with a friend or two so that they can run the server while I'm off, but I obviously want to keep my Google account secure. I'm pretty sure I had a password just for Aternos when I first made the account, so could I go back to using that to log in?