A appreciate the help and i apologize for being impatient,
i was able to find the correct area, however, my knowledge of .css code is Zero!
Fortunately i was able to try a few different keywords,
and i was able to "Center" the image itself, but it would still repeat.
any attempt at turning off the repeat would result in a broken background,
so instead i created a spacer in photoshop, and made an image wide enough that wouldn't be able to repeat, and i extended the image height all the way down with room to spare to emulate an whole un-repeating image.
as for the double post, some of the responses in the inferno board weren't from 2010.
(at least the ones i skimmed when i realized nobody had responded yet)
So i posted in the main free theme section, since my question was more of a general .css code question.
it was then that i had noticed, (after searching through many threads)
that a lot of peoples .css code (#main_body /* This is the Backtound area ) i had saw in screenshots, did not show up anywhere on my .css sheet, i became very confused and felt completely lost,
so i attempted to post in the most general support thread possible.