I think there are 2 issues.
1. The Current Parent domain is different from the old parent domain; so the username is the old one. Can I change the old username to match the current username?
2. I still don't have anywhere to enter the username and password. I have the correct address in the address bar.
see picture.
1. The Current Parent domain is different from the old parent domain; so the username is the old one. Can I change the old username to match the current username?
2. I still don't have anywhere to enter the username and password. I have the correct address in the address bar.
see picture.

