The whole point of the BBB is that you, the business owner, cannot manipulate them or their data. They are impartial.
They have an internal search page:
http://www.bbb.org/search/
With it divided into regions, it's been hit and miss at times, they usually come up in Google for me, a more exact google search:
site:bbb.org intitle:"company name"
are there any good ways to bring up your ranking on better business bureaus??