It only takes a small amount of force to pop the Twist Active Latch Nipple into the Twist Pouches.  The bottle, with pouch attached, should be on a flat, sturdy surface when pushing the nipple into place; make sure the nipple case top is attached while pushing; you want to avoid touching the nipple tip directly. 

You will know the nipple is in place: 1) you will hear a "pop" sound as the nipple falls into position, 2) you will feel the nipple fall into in place, and 3) the outer edge of the nipple at the base should barely touch the top of the bottle.

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