Here's some methods that might work.
1. Have another device or computer? Identify with that then, once logged in hit "Revoke Access".
2. Uninstall the app and then reinstall the app. It should log you out. Don't worry about uninstalling it. Your progress is saved on the server and won't be lost.
3.
support.toonslab.com
Try those in order and see what works best.