First you have to establish to this kitten that it can trust you. To do that you go down on his level. You do not stand, you either sit or kneel on the ground, thus you become less of a threat. You feed this kitten every day several times a day at the same time in the same place with the same bowl. About a week of this, take an old teeshirt and do a massive workout in it get it horrendously sweaty. Leave this shirt outside in the place where you feed and put the bowl of food on top of it. That is the beginning for this kitten to understand "your" scent. At not time do you attempt to chase, or grab the kitten and you do not look it in the eyes. It is a patience game, and unless the weather is turning rough, you wait and let this kitten understand that you are safe.