We highly recommend that you first try Twist Active-Latch Nipples before switching to a different brand - they are loved by a wide range of babies, especially fussy feeders who will not latch onto nipples from many other brands!
Certainly, if you wish to use another nipple brand to feed with Twist Pouches, it is very easy and straightforward. Just snap the pouch into the bottle according to the instructions, remove the cap, and thread the appropriate direct-pump adapter for your nipple to the pouch. Thread the nipple onto the adapter, then squeeze the pouch to push the air out through the nipple. Make sure the bottle is upright and level while you squeeze the air out!