I just created a forum today, and could not figure out some issues.

1. How can I assign a user for each forum?

2. I found out a forum as follow:
TJUAA-GNY Forum <http://bbs.tjuaa.org>

How can they change from http://tjuaa.s2.bizhat.com/ to <http://bbs.tjuaa.org> TJUAA-GNY Forum ?

Thanks a lot!