"Hierarchy" grayed out-cant make my mod

[jcapulet]

I'm trying to create a custom (extended game) mod but I can't make any selections to the "Hierarchy"- I want to select "Single Player" but all options are greyed out.

 

Here's what I did:

 

>Manage modules >New

>I filled in: the name and UID

>I set the "Script" to "None"

>Under "Extended Module" I selected "Single player"

>Then I clicked "Ok" to close it.

 

I then select the above made mod.

 

When I go to "Hierarchy" where I want to make it "Single player", it's greyed out and I cannot select anything.

 

Did I miss a step?

 

Thanks if anyone can help.

 

JC