Sign-in problem with my Photoshop subscription

I have a subscription to Photoshop. I recently signed in and mistakenly entered another email address.

Now, my entrance window shows THAT address and not the one associated with the account. And there is no place to back up and use my accurate email address, the one associated with the subscription.

So I haven't been able to use the application in my work.

Thanks in advance for any help.