Graco Contender Slim Instruction Manual page 57

Review your vehicle owner's manual for vehicle seat belt use
6. Route the Vehicle Seat Belt
Thread vehicle seat belt through the forward-facing
belt path (marked with an orange label) and out the
other side. Buckle the seat belt. The seat belt should lie
as flat as possible and not be twisted.
7. Lock the Vehicle Seat Belt
In most vehicles today, slowly pull the shoulder belt
all the way out and then let it go back in. You will hear
a clicking sound. Slowly pull out on the belt and it
should be locked. If not, review your vehicle owner's
manual and section 8-D.
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