i cant figure it out ultimate facebook

i install the the ultimate Facebook, and i cant get it to work like i want it to.... i want it to take post from my site and place them on Facebook automatically, and then that post have the ability to communicate either threw Facebook or my site with comments.... lol and i think some were i have a setting wrong.... because it wont do what i think it should.

thought process!

Two lane highway, right...
either threw posting on site or Facebook... and the comments should keep up with that.. back and forth... Right!

also granted admin privilege to site would really like some help... or suggestion... because my next task is the commenting+ plugin