Sometimes, after working with a loop for a while, you realize that there should be a hub before the first one that you have already posted for the students to start with. You can then change your mind and post a new Start hub. In edit mode of the loop, you go to the hub you wish to be your new Start hub, open the hub panel and pull the switch by the word Start hub to the right so that it goes green. Click save and you have a new Start hub.
