Ducati MONSTER 821 2016 Owner's Manual page 179

CLOSING
Make sure that all elements are correctly positioned
and fastened to the compartment under the seat (2).
Engage seat bottom front ends into pins (A) and (B)
on the support fastened to rear subframe. Keep the
rear part lifted, insert and push on the central fastener
of the seat: push the seat rear end until you hear the
latch clicking. Make sure the seat is safely secured to
the frame and remove the key from the lock.
2
A
B
2
Fig 101
Fig 102
177