I recently had to change my email address, and in doing so, I have had to re-register. How do I access my previous research material?
You should be able to log in using your previous log in information and then go to your FamilySearch account and change the old email to your new email. If you are creating a new account then that would make you recreate your living profile and people to connect with the worldwide Familytree. I do not think there is a way to merge accounts. If you need help with your old account (username/password) calling Familysearch is likely better than using this community to regain access to your account.