Hello, depending on if you are trying to register as a WordPress user, or as a Tutor LMS student. There is slightly different ways of going about it.
Either way creates you a user account, and can let you become a participant in a course, make comments, get discounts (Poly Pro), and more.
Here are the links to registration. I will include the old and new links, just in case one works better over the other in your browser.
Use this one: