How much space is there in the primary? If there's enough room, I'd boil the sugar for a time in a half gallon (or whatever) of water, cool, and dump it in the primary. I think it'd be hard to get 2+ pounds of sugar mixed very well if dumped in dry.
EDIT: Oops. I just repeated what Stale said. My bad.
Tap 1:Traditional Bock
Tap 2:Robust Porter
Tap 3:California Common
Tap 4:Old Ale