FiField Bonfire Owner's Manual page 14

For steps 5 -7 we recommend you turn the bicycle up-side down and
balance the bike on the handlebars and the seat.
5. The front wheel has 4 parts which will hold the wheel in place
while riding. These parts are a bearing, washer, lock washer, and
nut. On each side, remove the washer, lock washer, and nut and
place them aside; leave the bearing in place. (The bearing is a
circular piece with a small rectangular extension shown in step
6).
Note: the circular object on the wheel is the disk braking system (also
depicted above). In its current position, if the bike is facing forward, this
disc should be placed on the right side in between the brake pads.
Nut
Washer
Lock
washer
10