rotating tires

Can someone please tell me how i need to rotate my tires for a 1990 Buick Century. If you can provide a pic that's appricated if not that's cool to any help is much appricated.

Better yet, how about a video?? Try this link:http://www.edmunds.com/ownership/tires/articles/43785/article.html# . I saw it awhile back and thought it was a good reference for the DIYer.