Hyper Link inside of Image

Hello, I am looking to add a URL to an image on my wordpress Catch Theme. I have the media uploaded (image) and added the image to my post but i would like to add a URL to the image so people could click the image and it would bring them to an outside website. I have looked all over the edit functions in the image but can not find where I can add a link. www.reanimateher.com Thank you