Ducati MULTISTRADA V45 Owner's Manual page 43

Press the bayonet fittings (6), turn them clockwise to
tighten them.
Slightly move the latch (C) in the indicated direction
(towards the front of the seat) and disengage the pin
(10) of the passenger seat (2) by turning it and
matching it with the position chosen for the rider
seat:
- A, pin facing the front end, high seat;
- B, pin facing the rear end, low seat.
42
8
7
6
10
B
Fig 18
C
A
Fig 19