Press and hold down the panel above the Release Handle with one hand.
Squeeze the release handle with the other hand to unlock it.
Once unlocked, move the Belt Tensioner up and out into the fully open position by rotating it toward the center of the car seat base.
NOTE: You MUST press down on the Belt Tensioner above the Release Handle before squeezing the Release Handle to open. Failure to do so could damage the Belt Tensioner.