When setting the link structure according to the tutorial on your site, nothing happens when clicking on the "add link structure" - button.
Also no error message and the link is also not added. I "publiced"  the plugin, extension en module.  

Within Plugin setting, I choose "Apply for Virtuemart component"  = Yes , but it doesn't show any of the categories of Virtuemart to choose from.

Probably I overlooked something, but I don't know what.

(I'm working with Joomla 2.5.22 and Virtuemart 2.6.6.)

Kind regards,

Francis