well, it might take time.
the absolute first thing that should pop up is a box saying it is downloeading the latest version, followed by the box i talked about.
a box should show up with the words shoddy battle on it.
go to the team builder tag and well ... make a team.
once thats done connect to the official server and register.
not really, at least not to me anyways.
it is pretty straight forward.
just pick which pokemon you want with whatever nature, moveset, ev spread, and other things.