All students who work in your distributed loop are in a list in the teacher panel. When you click the name of a specific student you will see how far s/he has progressed in the loop and which tasks are completed. As a teacher you can choose to approve a task, give feedback to your student or both if that is what you wish. When you provide feedback your student will receive a pink notification that will show her/him that you have written something. If you approve the task, your student will see a green check symbol on the node you have approved in her/his loop. When you provide your feedback you can use the media you like best: text, sound or film. You can also embed material in your comments, just like when you build loops.
