Century PM-1707AB Manual De Usuario

Adjust car seat to upright or semi-upright
position and armrests to up or down position

.

Place forward-facing on vehicle seating position
with a vehicle lap/shoulder belt.

Tether may be used to help stabilize booster seat:

Attach tether hook (A) to anchor hardware 
(B) and tighten strap to remove any slack 
(fig. a).  

If tether anchor hardware (B) is not available, 
see “Installation of Anchor Hardware“ section.

If not using tether, see “Tether Storage” section.