This will teach him that you are not a threat. If the bunny finds the treat you have, hold it while he nibbles. Do this every day. Never force anything, and never chase the bunny. This will only undo all the patient sitting you have done to gain his trust.
Many rabbits seem to find a face less threatening than a hand.
Once the bunny learns that you are a friend, he will bond very strongly to you. In implementing the steps above, remember to imagine what the world looks like to this little, furry stranger. She's surrounded by a new environment, and there's a big, odd-smelling animal that's always looming over her. She has no idea you're trying to be friendly. So it's up to you, the new bunny parent, to provide her with quiet, safe space where he can learn to feel secure.