Feed only black paper, then let it sleep for an hour or two. Tame by being nice to him or her and stroking it on his/her head. WARNING: Do not feed human food. This will cause them to go crazy then die.

Hand Fujis:
Feed paper only, feeding human food will cause him/her to get sick.Be nice to her/him and your Fuji will be nice back. P.S. They like lined paper.
Beak Fujis:
You can feed them anything, human food, or paper. They like broccoli, peas, asparagus and Brussels sprouts, so you can give that to them. Beak Fujis are always nice.
Alligator Fujis: