Menu Items

Hi!
I’m using the plugin “Page Specific Menu Items” with which I can control which menu items are displayed. For my test site, all menu items are visible. How can I make the plugin-bar appear for this plugin or manually control which menu items are displayed on the test site?
Check this for an example: http://www.maennerpsychotherapie.de/test/maennertypen/
Thanks for your help!!