How do you put the back seats down completely in a trailblazer so it is level all the way back?

I owned my 2nd or 3rd blazer/trailblazer before I knew this: reach your hand in between the seat and the backrest. There you will find a small strap that allows you to lift the seat bottom up towards the front of the truck. Once you do this, the seatback will lay flat. hope this helps.