You can either 1) Enter your email on file and click "Get Login Link by Email," which will send a login link to their email that is valid for 48 hours or 2) Request Admin send you an invitation email 
Once you are logged in via login link, you can set a login password by clicking Change Password (screenshot) and will use that password going forward. Now you're all set!
FOR STUDENTS* If you need to update your credit card information, click Update Payment Methods.
FOR STUDENTS* Once enrolled into a membership, students will be able to view thier upcoming lessons, makeup credits, subscriptions, and invoices.