If you're knitting continental, this video should guide you through.
http://www.youtube.com/watch?v=_SfYSOvVI6o
If you're knitting english style, this video should do it.
http://www.youtube.com/watch?v=GZn_gTCmJNI
I have made these videos myself. I know the light is bad, but I hope you can make out something.
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The ways of Yarn are inscrutable.
I'm NOT a "miss", I'm a lady!