Linking virtuemart to joomla 2.5 website

[raeqelle]

Hello I'm very new to alle of this. Just downloadene joomla 2.5 and want to add virtuemart (2.0.18a (last update on Feb 2, 2013)) (http://extensions.joomla.org/extensions/129/details) to the website. The downloading of virtuemart was succesfull.
Ik found this website to make the link: http://www.inmotionhosting.com/support/website/joomla-25/install-virtuemart
only step 4 won't work... i cant't select anything in the  "menu type"- box.... I don't have a clue what to do next... who can help me with this??...