http://www.garywillis.com/pages/bass...al/relief.html
That should help you out. Read and understand, and keep clicking the arrows until you understand the problem. You're going to have to loosen your truss rod by rotating counter-clockwise just 1/4 of a turn. I stress just 1/4 of a turn. Take the strings of or loosen them almost all of the way first. It will take your bass a while (I've heard even a whole day) to adjust fully. So, read the page, make the adjustment it tells you, and don't make any more adjustments for a long time.
There may also be a way you can fix it with the bridge saddles - someone else could explain this better than me. But loosening the TR should work. Your problem is your action is TOO low. After you get it right, if the action is too high, just barely tighten the TR back (remember to straighten the neck while you tighten, that link will show you), give it a minute, and repeat until it is perfect, but not too low like it is now.