No worries! This is an easy fix.
Simply go through the Unroll.Me website and pass through the reauthentication steps with your email address and new password. Once that's complete, you're all set!
If you have difficulties with creating an app-specific password, you can visit our support pages for Gmail and iCloud accounts.
In Unroll.Me mobile app users just need to log out from the app and log in again with a new password.