Everybody will tell you something different but I will tell you my method. I get the male out of his cage and set him on a surface in the room. Can be a flat surface, a house plant etc. I let him sit for several minutes to calm down. Then I get the female out. I have her walk off my hand about seven or so inches in front of him. Make sure she walks away from him. He should show interest. If she doesn't walk I use something to prod her along. Usually it only takes a few seconds before he jumps on. Make sure she doesn't go crazy and try to grab him. If she does just try to keep her front legs away from him. Eventually she should settle down.
If not then seperate them and try again. You can also give her somethign to eat so when he jumps on she is occupied. He may jump on backwards but don't worry that is normal. He is just protecting his head for those first few seconds. He will turn around. I don't lock them in an enclosure but instead leave them in the room free. After several hours he will be done and will fly away. I give them the whole room so he has plenty of space to get away. These are very easy to mate.