Via the dashboard — effective from the next billing period. No notice, no exit fees.
You cancel from your own pages, under account and subscription. If you cancel within 30 days of purchase, the money-back guarantee applies: your first payment is refunded in full and access ends immediately. If you cancel later, the subscription runs to the end of the current billing period and you keep full access for the period you have paid for. There is no notice period and no fees. If you want to keep your data, export it before the account closes — see the export question in the same category.