You manage everything about your subscription from the billing page in your dashboard.
From there you can:
Change your plan: see the plans available to your account and preview any price change before you confirm it.
Update your payment method — add or replace the card or bank account on file.
Switch between monthly and annual billing.
Cancel — your plan stays active until the end of the period you already paid for.
Cancelling during your free trial (on or before day 10) means you are never charged. There are no contracts.