how do i can join the group ?

o.o
Not sure if serious.

This is the official group, whatever private group you are trying to enter, is unofficial.

Heheh... :)

I thought this was a joke o.o

I hope you're not serious...

Haha oh man this is too good to be true.

For private groups they invite you if they want, you dont just join. And since the leader of the group blacklisted you, you most likely wont be invited.