If you don't have children, put the cage in a room you're usually relaxed in, but not one with too much bustle. Place a small litter tray and his food in it. Change these regularly, but make no attempt to stroke the kitten. Keep all the room doors closed when you're putting fresh food or a fresh litter tray in the cage, just in case he escapes. If he does escape into the room, let him be, don't try to catch him to put him back, because this 'chase' will make him distrust you. Let him hide in the room, but make sure he stays confined in that room.
I kept Polly and Samantha confined in my bedroom for the first 2 months, and I spent a lot of time in there with them, just reading or watching telly etc. Samantha didn't need taming: she was a naturally confident semi-feral (a stray), and was at home in a couple of days. Polly was another matter - she sat behind furniture and trembled for a long time.
Your domestic circumstances, whether you are at home a lot, or if you have young children, will all make a difference to how you approach this. Allow the kitten as much undisturbed quiet as possible.
As most kittening pens are wire, put some shade over at least half of it, so that the kitten has a dark hiding place to feel safe in. This is better than leaving the cage (and the kitten) exposed.
If the cage you have is too small, you can usually borrow kittening pens from your local CP. (On tues I'm returning the one they lent me while Polly was ill. ) Some kind of donation would be appreciated.
Good luck with your kitten. Have patience with him.
