Hi, Using the add-on manager I added Dtodoist and when
I re-started the program the button for todosit didn't show up.
I tried it a couple of times. I would like to integrate it with Thunderbird.
Please right-click on the toolbar at the top, choose "Customize" and there should be a TD button there which you can drag & drop onto the toolbar. We will address this issue in future updates as the button should appear there automatically.