Hi mw......If you are aware that you have upset a person, be mature and go to that person and apologize to him/her and tell them how you will NOT do it again in the future. Be specific. Don't just make light of it and go to them and start idle talk. Be straight forward and they will see the apology as being sincere. Also, maybe an "I'm sorry" card also would be a nice touch.
Well it dependes on the mistakes you have done and the person who's been hurt by it. Am sorry would be the first thing to do and then comes and explenation "if any" and then a gift maybe or a time out with that person. Make him/her enjoy their time to the limit and show how deep you mean it.