Graco Booster Seat Owner's Manual page 10

Step 3
Attach elastic strap to the hook on the fabric, on the
other side of seat pad .

Step 4.
Flip seat over and insert the fabric from the head
support underneath the fabric on the lower back
support as shown .
To make insertion of fabric easier, slide the upper and
lower back pieces apart by squeezing the red
adjustment handle.

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