Links in images

How do I change links for articles ? I am just changing images but I need my own link to external site.Can you give me a hand please ? Right now it's linking to a page with the article content.
this the link that needs to be changed to my own=http://www.quevivalafamilia.com/news/38-the-cab-will-be-playing-all-of-this-years-warped-tour