If you are getting an error, try these "fixes", in this order, before calling the testing center directly. You can contact testing at:
806-716-4689 or 806-716-4631
1. Make sure your browser is a current version of modern browser. Some common browsers include Google Chrome, Mozilla Firefox, Safari, Microsoft Edge, Opera.
2. Delete your cookies and refresh your browser
3. Clear your cache and refresh your browser
4. Try to register on another device