You will want to open a ticket to support with the domain you want to renew, and for how many years you want to renew it for.
If you are a current customer, it will be applied to your account for payment.
If you are no longer a customer, you will want to submit payment information to our online form at https://www.hivelocity.net/company/ccpay.asp
You will then want to open a ticket with support letting them know you have submitted payment and you need the domain renewed. They will check on the payment and then renew domain.