If I am understanding this correctly (I'm probably not), You go to the Git tab in Studio, select Launch Git UI (?). When i do that I get a small window with a red X button graphic and nothing else. I was thinking it would have a window to enter in the commands/ code you mention, I don't seem to get that.

Yes, as far as I know.

Where and how did you get the Git plugin for Studio? This is what we thought might be the solution. But we thought we had already installed any extensions/ add-ons needed.