Ducati MULTISTRADA Instructions De Montage page 17

From the outside, remove the complete plate (C), paying
attention not to let latch unit (D) fall out; latch unit consists of
the red button, the inner latch and springs.
Open and take key lock mount (3) out of the hardware set (2).
Take the key lock (E), supplied with the motorcycle, and fit it
inside the mount (3) until you hear the tab click in place and
lock the two parts together.
2 3 E
C
UK
D
fig. 4
fig. 5
17