Tap "Forgot password" on the sign-in screen. You will receive a reset link at the email you registered with.
Make sure you are signed in with the same account on each device, and that the device has an internet connection. If the issue persists, email us with your account email.
Open the app, go to your account screen, and tap "Restore Purchases". If it still doesn't appear, send us your Apple receipt and we will sort it out.
Email tangeduer@gmail.com from the address you registered with, asking for account deletion. We will remove your account and study history within a reasonable period.
Please email us with the question number or a screenshot. Corrections help every other student using the app.