To specifically register someone else for class, follow these steps:

Click the link above >> Sign in using your email and password or create an account >> Click the 'Classes' tab >> In the box on the right, choose 'make a reservation for someone else' (you may need to wait for a few seconds for the next window to open >> Enter the persons name and click "make a single reservation" >> Purchase a Single Class >> Complete your purchase and you should be good to go!