It's not really strange, just foreign. DreamHost has a similar interface of its own!
There are two types of service regarding DNS: registrar and hosting. You have to update the registrar company with the nameserver information. The nameservers point to the computers at the company that is doing the DNS hosting. Once you got DNS hosted you get to add DNS records for the mail and subdomains etc.
So what you are looking at is their DNS hosting configuration page. You need to get to their DNS registration page instead.