How do I change or cancel my monthly plan?

Manage it from the Subscription tab.

A monthly plan renews by itself each month at the full package price.

1. Select Lessons & Billing in the menu.
2. Open the Subscription tab.
3. To cancel, select Cancel subscription. To change plan, choose a different one on the Buy Lessons tab.

If you cancel, your plan runs until the end of the period you've paid for. You won't be charged again, and your remaining credits stay in your account.