I have gone through that too and it’s kind of stressing but also funny 
I don’t remember the exact steps to log into your knew account but it’s not the writer’s portal fault. What you gotta do is play with your Google account. If you have already logged in the account you don’t want (in Google) and you wanna log with the new one (in the portal) it’s possible it won’t let you and will redirect you to the Google account you logged in Google.
Idk if I’m explaining myself right buttt I recommend you to open a new Google page there’s a way to have two Google accounts at the same time😂 If you know how, let me know if not (either way) I’ll show you with pics !!!