There is a video here that someone posted. If you have trouble following the link, let me know and I'll work around it.

HOW to forgive? Literally, the person who has hurt you is tied to your back as long as you don't forgive them. You need to emotionally and mentally CUT THE CORDS that are binding them to you (picture having them tied to your back) and "let it go, release it/them." You don't forget so that you don't step into harm's way again, but you cut the cords of anger, pain, resentment and any thoughts or ideas of getting even. You're not so much cutting them free as you are cutting yourself free from a heavy, cumbersome load. Like Madisgram said, it helps to pray about it, too.