As far as I know you do not have to register first.
I have been a member of another YuKu group for over a year and did not need to register.
Katha, Luca, Nomad and Daisy have all applied.....I don't think they registered first.
As for Hell's group for some reason I cannot get in hers
I have managed to get into a couple of others though.
Did you click the link I left in the first post?
OMG I hate new things LOL!
Having to learn new stuff all over grrrrrrrrrrrrrrrrrrr!