Begin with a stitch on the hook.  Wrap yarn twice around hook, then insert the hook into a stitch in the fabric or row.  Wrap yarn around hook, draw hook back through stitch. 

You now have four stitches on the hook. 

Wrap yarn around the hook, draw hook through two stitches closest to the end of the hook. Now there are three stitches remaining. 

Wrap yarn around the hook again, draw hook through two stitches closest to the end of the hook. Now there are two stitches remaining.

Wrap yarn around the hook one more time.  Draw the yarn through the two remaining stitches.