First, welcome to Fish Lore
Can you tell us more about your tank and fish? How large is your tank? You have only 2 Angels, correct? Any other fish in the tank? How old do you think your Angels are? They must first reach maturity before they start to breed, and they must be a mated pair of course.
Generally, when Angels are mature and are a mated pair, they'll start to breed. Good temperature to keep them in is around 79 - 80F. They should also have clean water (very low nitrate or none if possible), and their diet should be rich, i.e. flakes, bloodworms, brineshrimp, etc. It's best to have a sponge filter in the tank if you want the angels to raise their young (sponge filters prevent tiny fry from being sucked in). The two angels should have the entire tank to themselves during breeding time and when they raise their young.