FYI--While the tutorial is mostly quite good at explaining the plugin's capabilities, I don't think it tells you 1. that TW-Commander adds a button to the sidebar and 2. that pressing the button opens TW-Commander. I had the same issue as TT at first. That issue was compounded by the fact that the button wasn't showing in Quine until I closed and opened the app. I discovered that I had installed TW-Commander correctly by accident when I asked myself, "What does that button resembling a document do?" Then I realized what was going on. As a newb, I hadn't gotten used to probing TW to find stuff yet, so I was lost. Given TW-Commander's power, maybe that's a good thing.