Tell funny stories from your experience. These will be more effective than jokes, simply because you're closer to the material and more comfortable. Use humorous visuals or props. If you help your audience visualize a humorous situation, you're more likely to get a laugh and simultaneously increase their understanding. Turn everyday situations into funny anecdotes.
People are more likely to find humor in situations they've been in themselves.
This explains the success of comedians such as Jerry Seinfeld and Bill Cosby. Let your natural sense of humor shine through. No matter what, you don't want to seem artificial or uncomfortable. This will undercut any humor you attempt to use. Try to be as natural as possible, pulling from your own personality instead of imitating others.