If your domain name was a new registration at the time your ordered your hosting account, it was most likely registered with our domain registration division SiteReserve.com. You may visit the sitereserve.com website to make renewal payments for your domain or email accounting@sitereserve.com with questions.
If your domain name was registered with a different Registrar, you will need to contact that registrar directly for assistance with your domain registration billing. If you are uncertain if your domain name is registered with SiteReserve, feel free to contact them at sales@sitereserve.com.