Hi All! Have been playing PL for about 3 weeks now and i just love it but hope someone can help me with my question!?!?

Took me a while to find the entrance to Alien Oasis Part I but found it and have been playing it for to many times now and am almost ready to shoot myself so I really want to know how I get in to Part II..can't figure it out and the internet isn't much help Also can't join friends how are playing Part II..

Bought all the dungeons a while ago so that can't be the problem.. I'm level 42 at the moment

Hope someone can help me and put me out of my missery