If you use Typingclub.com (which is an amazing resource) there is the possibility that a student either missed the first day you introduced it or the student is new to your school.
If this is the case, simply enter into typingclub.com and if you use Google Classroom or Clever, simply select the icon (in this example we used Google Classroom). It then will populate all your classes and you will see the one you imported for this classroom. Make sure to choose re-sync (it is blue) and the student should be added.
Embedded below is a 1 minute and 24 second YouTube tutorial. You can also click on this link to show you how to get started with Typingclub.