Let the animals go as close, or stay as far away, as they want. Repeat short introductions as often as necessary, until the animals are able to stay comfortably in the same room, with supervision. Don't expect instant friendship - that takes time. If he has a favorite sleeping place, don't let the kitten sleep there. Provide the youngster with her own toys.
Animals are often possessive of their food and feeding dishes.
Ideally, since the kitten should be eating her own kitten food, have her feeding dishes in a different room or area as long as possible. Monitor mealtimes to prevent either animal from pushing the other away from its plate. Since kitten food is best for her first 12 months, it may be a good idea to continue feeding your kitten in a closed room for awhile. Although a premium quality food formulated for All Life Stages will provide complete and balanced nutrition for both animals, if your adult cat tends to be overweight, he does not need the extra calories that a kitten food provides. In fact, if your cat is already eating a diet intended for weight loss or weight control, the kitten will not receive all the extra nutrition she requires for her growing body if they are sharing food bowls.