Graco Pack‘n Play Owner's Manual page 7

7. Pull the two hook and loop tabs
under mattress/pad through the
slotted holes and attach to hook
and loop patch on bottom of
playard.
8. Pull the four snap straps on
corners of playard mattress
through bottom of playard. Wrap
around the tube and fasten snap
onto the tube. Repeat on all
corners.
9. Tuck four corners of mattress/pad
under corner stiffeners.
SNAP!