When you import users the system will generate login names based on the rules in the user template you select. These login names need to be be unique, if they are not they will be highlighted for your attention. This video will show you how to change the the user template import rules so that each student is given a unique login name.

For the sake of expediency and to reduce network usage this video may have been optimised to remove periods of inactivity and may not display events in real time, as you would expect to see them on your own network.  You should not be concerned if tasks take more time to complete than indicated by the video.