You have to pull off the two side covers, which are held on with one bolt each. Remove the bolt (the left side one is at the very bottom, the right side one is at the front/top corner) on each cover and pull it away from the bike: each has two rubber gromits that hold it onto little studs on the frame.
After the side panels are off, you will see the two bolts holding the drivers seat on, one on each side. Once you undo them, lift the front of the driver's seat up and then pull it forward, as the rear has a tab that goes under a bracket. Once the driver's seat is off, you will see the two bolts holding the passenger seat on, bolted through the front of the passenger seat. Pull the passenger seat up and forward. The sissy bar pad is just held in place with rubber grommets, so just pull it forward to remove it and access the tool box.