To join your study group, select the link in the email or message that was sent to you. Please note that a subscription is required to join a study group. If you have been invited to a community subscription, be sure to accept that invitation before accepting the invitation to your study group. If you already have a subscription, just sign in. You will be enrolled in the class and the person who invited you will be able to see you there.
You can find and resume any course by visiting your Home page and looking under the Path tab, where you will be able to see all of your in-progress courses.