Do you mean the backing also serves as binding on the front? If so, tell me your email address and I'll send you instructions.
If you mean attaching a separate binding to the back, then folding to the front, there are several different methods out there.
URL: http://www.hgtv.com/hgtv/shows_qlt/article/0,1805,HGTV_3876_3178320,00.html
Or Google-search on "mitered binding on quilts". I've lost count of the different number of methods. Experiment until you find the one that works best for you.