Please note that accounts created on old database can not be used in this new app (because this app uses new database) Therefore, you need to create a new account to access the shows in this app. Read this article for the announcement on database migration.
As with Sign-up, you can sign-in to the app using three options:
Manually Sign-in using email address and password that have used when Sign-up
Sign-in using Apple, Google or email/password pair