How do i publish an application as the default root website in IIS?

Hi,

I'm trying to change the Virtual Path of an Application in IIS7 to be the web root "/"

My Virtual Path and folder in the application is now "/wordpress"

I want the Virtual Path of the application to be: "/"

So the resultant url will change from www.myweb.org/wordpress to www.myweb.org/

When I go to the Advanced Settings the Virtual Path it is Greyed out & when creating a Virtual Path it doesn't let me add a slash. "/"  - See attached pic.

I have tried changing the "Default Web Site" physical path and application pool but no luck.

We're using IIS7.  This is a wordpress application.

How can I fix this problem?  Thank you.