Knitting socks on 2 circular needles

Hello, I am attempting to knit the simple toe up sox on 2 circular needles. The pattern states: using waste yarn cast on 36 sts. using any provisional cast on technique. please explain this. Thanks Shirley

Amy has a provisional cast-on video on this page.

http://www.knittinghelp.com/knitting/basic_techniques/index.php

Scroll the page down a little and you will see it.