You bought a pass or intro offer with just your email. Here is how to use it and how to get back in on another device.
The page you land on shows what you paid and a "Book a class with it" button. If your email was new, you are already signed in on that device.
Open the receipt email and press "Book a class", or go to the studio's sign-in page, enter the email you paid with and type the code we send you. Your pass is there. There is no password to set.
That happens when the email already had an account, or when you paid inside a studio's own website. Press "Email me a code" and type it in; the purchase is already yours.