To cancel the Duolingo free trial (Super Duolingo), the general steps are:

1. Open the Duolingo app.
2. Tap the profile icon and then tap the gear icon (settings) at the top right.
3. Under the subscription section, tap your current subscription.
4. Tap "Cancel subscription."
5. Select a reason for canceling and confirm.
6. You may be redirected to your payment platform (Google Play, Apple App Store) to finalize cancellation there.
7. Confirm cancellation on the payment platform; subscription will remain active until the end of the trial/billing period but will not auto-renew.

For iPhone users, cancellation must be done through the device's settings subscriptions manager, not in the Duolingo app directly.

This process ensures you avoid being charged after the free trial ends.