Simply register an account! While no further verification is needed, we will remove any accounts or repositories that abuse this service.
Yes. However, we expect you to use it for open-source and non-commercial projects only. This also applies to private repositories.
If you registered for the old Gitolite-based Git server, please send an e-mail to email@example.com, to have your old repositories migrated to the new server.
Note that you will have to slightly change your remote URLs, and that you must still have access to the SSH keypair that you signed up with.