Here is a verbal description of binding off. It assumes you are working on the "knit" side of a piece that is knitted in the stockinette stitch, because that is by far the most common place to do it.
Step 1: Knit 2 stitches.
Step 2: With the left needle, bring the first stitch over the second stitch and off the needle. Pull it up a little so it is loss on the needle.
http://video.google.com/videoplay?docid=1713550754206421652 (Continental style)
http://video.google.com/videoplay?docid=-3284006732963888317&hl=en (American/English style)