NOTE: Because registering iClickers on iclicker.com now requires a fee, the Center for Teaching and Learning has set up their own way to register by going to https://ctl-clicker.byu.edu/home.php.
See here for details on the old way of registering, and below for details on the current way.
Also, professors will need to enable these registrations in their courses. For instructions on that, follow KB0028153.
If you have the number of an iClicker and need to know to whom it is registered, open a new tab and navigate to ctl-clicker.byu.edu/?c=[iClicker number]. For example, ctl-clicker.byu.edu/?c=472C2843. If the iClicker is registered, it will show the name and Net ID of the individual to whom it belongs. If the page is blank, the device is unregistered.