BuddyPress.org

you need to have a wordpress multisite done….and install buddypress on a folder/domain…check codex’s of both..you will get an idea how you can run wp on main domain and bp on sub domain or sub folder

trust me..you are not able to manage in the current scenario which you have…

this is a free support forum..you dont need to talk to me on a one2one basis…custom help is not an option here…you might have a look at the job board if you are looking at custom help

best of luck