In many cases, many clients have their domain set for auto-renew, but if you need to renew manually, Renewing your domain name with Inet7 is easy!
Login at https://manage.inet7.com
Click Domains > Renew Domains
Click the box to the left of the domain you wish to renew
Select the number of years from the drop-down on the right, click "order now" on the bottom.
Follow the prompts of the ordering system for payment to complete.