Okay, let's keep this simple.
We provide access to the OpenSRS domain registration system so you can register domains, manage DNS, domain forwarding, email forwarding, etc. If you have problems, we help you by email or phone. If the OpenSRS automated system can't reach you to let you know about renewals or required registrant verification, they let us know and we try to track you down to resolve the issue. In return, we add a buck or two on top of the fees charged by OpenSRS, ICANN, and the credit card companies.