OOOOooooooooooookay, that site has a mix of ok advice, and bad advice. A good hint is the fact that all of the bonsai pictured on the page are freshly pruned nursury material, and NOT real bonsai. Junipers are an outdoor bonsai!
Try this page instead, it has much better information on how to take care of your baby
http://www.bonsai4me.com/SpeciesGuide/Juniperus.html
Good luck!
Maryjane,
Aka weeble