If you don't want to manually renew your domains, you can set them up to be renewed automatically.
When looking at the list of all your domains, you can simply toggle the Auto-Renew option On and Off next to each domain. When you use this option, your default Domain Auto-Renew Settings will be applied (see below). Too easy.
Please ensure that you have sufficient credit in your account at the time of the auto-renewal or it will not proceed. You will be notified if the auto-renewal cannot take place due to insufficient funds, in which case, you should top up your account asap so the auto-renewal can be processed again the following day.
If you want to configure the auto-renew settins on a per-domain basis, just follow these steps:
These settings are found in the Account > Preferences and are applied by default when you enable Auto-Renew for a domain.
By default when a domain is renewed a confirmation email will be sent to the registrant contact. You can disable this email in your Account > Preferences.