In case it is not clear, the idea is to go through the Tasks one by one starting at the top.
If you see something in a Task that interests you, you want to add a relevant comment, correct an error, etc then participants can do that. Or even add a new Task (they are not drag and drop/groupable yet, you have to use the little arrows to move them up and down the list)
If there is nothing that interests you there, just move on to the next Task.
Repeat.