During shipment, zip ties held the accessory kit down to your OT-2's deck. You'll need
To remove them before you can use your OT-2.
2.5 mm hex screwdriver (included)
Use the 2.5 mm hex screwdriver to remove the two screws fastening the deck. Don't discard these two screws.
Lift the deck out so you can remove the zip ties. Then, replace the deck and refasten the two screws.