If you're using a device that has a big screen, you should be able to see the 'Register' button at the very top right of your screen.
If your device has a smaller screen and you cannot see the blue 'Register' button at the top right of your screen, please click the hamburger icon (☰) to expand the menu so you can see the blue 'Register' button.
When you click this button, it should send you to the registration page. Please fill out the form and then click the 'Submit' button. You will receive a confirmation link in your email to activate your account.