If you can post here then you can go to your homepage, click "Contact Admins" in the top right, and send us a request for a non-Steam password. Include a full Discord name (or even Email if you prefer) so we know exactly who to tell the password. Then untick 'Login with Steam' under the lobby settings and log in with that password.
If you cannot post here, then try logging into the site with Steam. Maybe that works.