In order to use a domain you have registered somewhere else with Otto, you just have to point the name server it is using to the ones used by Otto, namely:
ns1.sonician.net, and
ns2.sonician.net
How does this look with different registrars?
With most domain registrars, you should be able to set the nameservers it should use directly in your control panel for that registrar, see the GoDaddy example below.
For some, you may need to send it off-line, as a form, see the one.com example below.
Ex. How to set nameservers to sonician with one.com
With one.com, you need to fill out the form you find on: http://one-docs.com/forms/request-to-change-name-servers.pdf, and send it to sales@one.com
Ex. How to set nameservers to sonician with GoDaddy
Below you'll see how easy this can be done with GoDaddy, but it's a very similar process with most Registrars you could currently having your domain registered with.
1) Login to your domain management account, and find your domain.
2) Go to Manage Name Servers, it can look e.g. like this:
3) Set your name servers to the ones of Sonician, see e.g.:
