This menu was originally crerated following instructions in a CoffeeCup help article. It was created in RSD 2.5. Recently I changed it to grid so that it can be used with SD3. I also made it sticky, so that it does not scroll out of sight when the page is scrolled down.
In the programme the nav is covering the contents below it. Therefore, in order to edit the contents of any container below the nav, here called '.comments', it would be best to make the .nav container temporarily invisible. Set the display to 'none', and don't forget to set it back to 'inline-block' when done (Display -> More -> Select).
To make it into a component, just select the container with the class name .nav.