GMC 2008 Yukon Denali Owner's Manual page 30

Removing the Third Row Seat
To remove the seat, do the following:
1. Open the liftgate to access the controls for the seat.
2. Fold the seatback forward using the instructions
listed under "Folding the Seatbacks" previously.
The seat cannot be removed unless the seatback is
folded.
4. Roll the seat out of the vehicle. There is a track in
the floor to guide the seat wheels out of the vehicle.
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3. Unlatch the seat from
the floor by pulling the
carrying handle,
located at the rear of
the seat, rearward.
Installing the Third Row Seat
To install the seat, do the following:
1. Open the liftgate to access the rear of the vehicle.
2. Slide the front outboard seat wheels into the
track on the floor and roll the seat forward. The front
latches should lock into place. If the latches do
not lock, try tilting the rear of the seat upward
slightly.
3. Lower the rear of the seat and push down on the
seat to engage the rear floor latches.
CAUTION:
{
A seat that is not locked into place properly
can move around in a collision or sudden stop.
People in the vehicle could be injured. Be sure
to lock the seat into place properly when
installing it.