BuddyPress.org

Hi,
I’ve converted my forum from bbpress1 to bbpres2 plugin. It was all about 14000 replies.
now is it safe to remove old bbpress tables from database? I mean those starting with wp_bb

and, could you please answer to these questions?
1- how can I add a hint above text editor, below “Create New Topic in…”? just like here, which is: “If asking for help, please include your WordPress version…”

2- Users must first join a group to be able to post replies. is it possible to post replies without joining the groups first? just like the old way, so users become a member of that group after they post a reply.

Thank you in advance