When your student want to enter your class, they should use their first name and the passkey that you have given them. If the system asks them to use a different name, they can just add a number to the end of their name. You may decide from time to time to change your passkey. Since passkey is global to all of your classes, then should you have already given your students your old passkey, you must make sure that they have the most current passkey when they are entering your online class.