Pontiac 2005 Montana Owner's Manual page 86

4. Then press the leg rest firmly into the seatback,
and secure it by pressing the upper corners
against the fastener strips on the seatback.
1-80
5. Rotate the head restraint forward and push it all the
way down.
Just like the other restraint systems in your vehicle, your
built-in child restraint needs to be periodically checked
and may need to have parts replaced after a crash. See
Checking Your Restraint Systems on page 1-91 and
Replacing Restraint System Parts After a Crash
on page 1-92 .