Chevrolet 2007 Avalanche Owner's Manual page 180

2. Starting with cargo panel 1, place the latches
in the unlocked position. Place cargo panel 1
on the cargo area rails while holding the
back of the cargo panel up.
Left Side Shown, Right Side Similar
Push the panel forward until it is snug against
the midgate and then let the back of the
panel down being sure that the pegs align with
the receivers.
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3. Push both left latches away from you to
lock the latches. Remember that there are
four latches total for panel 1. You should hear
a click when each latch locks. Lock the
remaining two right latches on panel 1.
For any cargo cover panel you must lock the left
latch in place before you can lock the right latch.
If you do not follow this exactly, the cargo cover
panels may not lock in place correctly.