Same as any gTLD, pick your favorite registrar and they probably support it. Give your registrar money, they'll give the registry money and boom. (more or less)

When .name was new, you may have needed to contract with the registry directly, it was an early new gTLD and I don't remember if they started with the registry/registrar split or not.

Afaik, new registrants are not able to register a third level domain, but second level domains have been available for a long time.