Graco Century Owner's Manual page 66

A
When using the base:
To lower the foot; push button in on base A
and pull down on the bottom of the foot B to
the desired setting .
To raise the foot; set the base on a flat
B
surface, push in on the fingers on the base
and push down on the base .
If there is still orange in the level indicator
when the foot is completely extended then
place a rolled towel under the foot until
ONLY blue shows .
When using only the infant restraint, if there
is still orange in the level indicator when the
infant restraint is resting on the vehicle seat
then place a rolled towel under the infant
restraint until ONLY blue shows .
Readjust the vehicle seat belt as necessary
to secure the infant restraint firmly in the
vehicle seat.
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