[xubuntu] Gnome User Themes inquiry

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http://ubuntuforums.org – I had posted previously a question about how to make my shell user themes work in gnome. One of the answers directed me to here: https://extensions.gnome.org/extension/19/user-themes/ My goal is to make the orange triangle go away so that I can theme my shell. I have Gnome up and running and I am logged into it now. I understand that it must be of the same version of gnome that is acquired in update manager. How do I use this to install shell user themes? Thanks in advance. ](*,) (Hardware)