Pop 3 large pans of popcorn. Use kitchen sink as your very large bowl (make sure clean and dry). Pour popcorn in sink.
Melt the above, stir while melting. When mixture is smooth, pour and mix into popcorn.
Put butter or small plastic bag over your hands to form the popcorn balls. Work as fast as you can. Reshape or squeeze each popcorn ball. Popcorn balls stay pretty soft.