why do I have virtual pages? and how to do them beeing real?

directory plugin makes me 4 virtual pages which I can't use for anything.

how to change them in real pages?

other problem, if in standard wp settings it's not allowed the sign up for everyone, I can not get a sign up page.

bbpress is overwriting the directory plugin or the inverse?

what I am doing wrong?

i am not beginner to wp. but never worked with bbpress and multisite.

thanks for your help

Phil