I am trying to create a shared search scope but I cannot find the right place to do this. The only place I can edit scopes is on the link marked with red in this screendump:

When clicking this link I navigate to to local scopes in next screenshot, where 2 predefined scopes already are shared:
Then I try to click Site actions -> Site settings and then this screen is showed:

If I click Search scopes in the above screen this picture appear:
- But even these scopes are not shared when created!? And then there are the red error message. I dont get it!?
I need to create shared search scopes since I am writing my own webservice on the search server. I hope someone can give me a step by step guide to create these shared search scopes in Search Server 2008 EXPRESS. Thanks in advance! :-)