You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
The back stitch is only one stitch in cross stitching and is not the basic stitch. You Tube has a whole series of cross stitch how to's. See below link.
http://www.youtube.com/results?search_query=how+to+cross+stitch&search_type=&aq=0&oq=how+to+cross+s