On the Klasly sign-up page, say who you are and find your studio by name. Members sign up on the studio's page; instructors ask to join.
Choose "I'm new here". If you already have an account, choose "I already have an account" instead — owners, instructors and members all sign in on the same page.
"I book classes or sessions" if you are a member or client. "I teach or work at a studio" if you are an instructor or staff. "I run a studio or my own practice" only if you are opening your own studio.
Type part of the studio name and tap it. You go to that studio's own sign-up page; create your account there and you land in their schedule.
Find the studio, then leave your name and email and press Send request. When the studio adds you, you get an email with a link to set your password.