Get some puppy treats (or just some hotdog weiners) and everytime he does what you say, praise him and then give him a reward!! You may have to literally "sit" him down a time or two, (push down on rear, up on head gently) but he will catch on really fast!!

Works everytime! Then as he/she ages, cut down on amount of the treat...

My dogs just sit everytime I open the fridge...but they hunt very well!