New PowerPC MacMini online and waiting to become a Builder

[Bertrand Juglas]

Hello,
I've put online my PowerPC MacMini running Fedora 12.
It's waiting at tv.juglas.name for SSH connections authorized by public keys.
So i would like to make it become a Builder of the PowerPC secondary
architecture koji installed by Josh Boyer.
Can you explain me what I have to do to make this server become a Builder ?
Thank you in advance,
Bertrand