I've added the pictures to this article which may explain the the method a little more:
Standing to pee (a guide for FtM) (http://susans.org/wiki/Standing_to_pee_%28a_guide_for_FtM%29)
Many thanks to zombiesarepeaceful (https://www.susans.org/forums/index.php?action=profile;u=2314)
Steph