You can enable the comments for a tour inside the Editor UI.
Select Virtual Tours -> Editor UI from the side menu. Click on the Comment icon.
You can enable comments throughout the entire tour or set them individual for each room.
If you have "Allow editing in tours" enabled in the settings, you will be able to set up a different Disqus account for this tour, otherwise you will not.
Click Save on top right corner of the page.
This is an example of the end result.
