asalvo TRIO ROMA II Manuel D'instructions page 31

SEAT UNIT (I)
1. Assembly of the seat
Release the belts under the seat unit by separate the Velcro straps.
Insert the seat fabric carefully onto the frame. Place both pins into the
corresponding openings from inside the handle. Press downwards until
pins are fixed.
Repeat the same actions to fix the pins of opposite side. Make sure pins
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are well fixed both sides. Insert the belts under the seat through side tu-
bes of the frame (tubes for basket assembly). Join the belts and fasten
Velcro straps to fix the seat to the frame.
ATTENTION! Make sure the seat is well fixed and is stable before each
use.