there, How can users "register" to sub-sites on a network?

Hi there,

How can users "register" to sub-sites on a network? And is there a way to let people comment in the "forum" publicly? Or would I need bbpress or something like that for public forums?

I was trying to let users register on a subsite (ONLY) and to register to the forum. But every time in doing so, it only sent them to sign up for a new website (blog) on my network?

Trying to figure out how "users" can register with the sub-sites. And forums for that matter, without having to join the overall multisite network? It may not be possible.