Short answer
Sign in to the client area, open Services, choose the service, select Manage and then Cancel Options. Choose End of Term to keep it until the paid term ends, or Immediate.
Before you cancel
Download anything you want to keep first. When a service ends, its files, databases and email are deleted and we do not keep backups of cancelled services.
If you pay with a PayPal subscription set up in the past, also cancel it in your PayPal account.
Changing plan instead
To move to a bigger or smaller plan, open a ticket with Sales naming the service and the plan you want. Upgrades are usually done the same day; downgrades at the next renewal.
Questions people also ask
Do I get a refund?
Hosting is not refundable once it is set up. See the payment policy for the details.