Assuming you're talking about a veiled....i usually start them off with a thin wedges of apple because it's easy to stick the end of the piece in the chameleon's mouth or put some finely diced bits in a dish on the floor of the cage so that if the chameleon shoots at a cricket it might get pieces of food in its mouth. Once they realize that greens and veggies and fruit can be eaten they will go for it themselves and you can use the dish method or hang pieces on the branches.