How do I register RHEL 7.3?

Hello, I just installed a trial of Red Hat Enterprise Linux Server 7.3 on VirtualBox. (I'm not sure if this is the right section for support.) Now, I need to register it. After bringing up "System Registration", I have to enter "my server url." It's just me at home on my PC and I have no servers. What should I enter for my server url? I tried my IP Address but it didn't work. I have a domain on Host Gator, will that work? Please respond so I can register my trial. Thanks