Simply wrap whatever rolls you want to heat up in the aluminum foil and place them on top of the food in the crock pot. Yes, it's that simple.... I usually add the wrapped bread the last 30 - 45 minutes of cooking time and it is completely heated through.
crockpotrecipeexchange.com/2010/10/warming-rolls-in-your-crock-pot.html
crockpotrecipeexchange.com/2010/10/warming-rolls-in-your-crock-pot.html