Graco Contender Slim Instruction Manual page 44

Review your vehicle owner's manual for vehicle seat belt use
A B
6. Route the Vehicle Seat Belt
Thread vehicle seat belt through the rear-facing belt path
(marked with a blue label) and out the other side. Buckle
the seat belt. The seat belt should lie as flat as possible and
not be twisted.
Note: It may be easier to route the vehicle seat belt by lifting
seat pad up to expose the belt path.
Make sure the vehicle seat belt is in front of the buckle
strap when the buckle is in the inner-most position (A), and
behind when in the outer-most position (B).
7. Lock 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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