You can register 70+ domain TLDs with us, most of these are registered in real time -- in over 95% of cases without our assistance. This is a fully automated process. However, in case of some of the country-specific TLDs (such as .ru or .cz), the registration process might take longer, sometimes two days, depending on the TLD. And in some cases, e.g. with the Canadian .ca domain, the registry will later send you an email and you do need to verify the registration by replying to it.
After registration you can also administer your domain name, e.g. appoint nameservers to it or change address details, all from within your billing/admin control panel.
Just login, go to "My Domains," click onto the small arrow icon right of your domain name, and here you can change whatever details you need to change.