BB Boom IZZA Notice D'utilisation page 34

5.2. Securing your child in the enhanced child seat
Forward Facing: Child height 76cm-105cm/ Child weight≤22kg;
Recline position Positions 1,position2,position3
1. Press the strap adjustment button,
while pulling out the shoulder
harnesses to the proper length.
3. Fix the two metal sections of the buckle connector on the both sides of the
enhanced child seat
4. Place the child into the enhanced child seat and pass both arms through the
harnesses. Position the harness straps at or below the child's shoulders. After
the child is seated, re-check whether the shoulder harnesses are at the proper
height.
2. Press the red button to disengage
the buckle.