Here is what I meant...
When you left click to get the menu, pick
Settings>Modules. In that dialog, if itask-ng is on the right side, it's ready to be used--otherwise select from the left side and click
Load Module. After it's loaded, exit that dialog and left-click menu again to pick
Desktop>Shelves. Once you select a shelf, you go to
Set Contents , and you can add itask-ng to it. Don't get fancy with autohiding the shelf or anything yet; you can play with those settings later. So when you close and get back to the desktop, the shelf should have the itask-ng, but don't ask me any further than this about taskbars; I'm allergic to them
The downside to knowing about mouse-copy-&-paste is, when you somehow wind up on a Windows PC for some reason, you will think their mouse is broken since it won't copy for sh*t.