Networks for Wordpress plugin set up

Hi guys I need some help in setting up the Networks for Wordpress plugin. Made a brand new multisite installation (www.website.nl/newsite), read all there is to read about the plugin (not much), activated the plugin and moved the required php file to mu-plugins. I am only able to network activate it (which is not the idea I think), it does not show in sites plugin list.
When I do activate it through network nothing happens. Help is much appreciated! Nick