Hummer H2 2010 Owner's Manual page 56

4. Squeeze the release handle while pulling the seat
out of the slots on the floor.
5. Roll the seat out of the vehicle while holding the
rear of the seat up.
2-18
Installing the Seat
WARNING:
If either seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatbacks to be sure they
are locked.
WARNING:
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.