If you and your provider have a session scheduled today or tomorrow, you will see this session listed under "Today's Reminders" or "Tomorrow's Reminders" on the left side-bar of your profile page.
To "Check-In" to a session scheduled for "today," click the "Check-In" button located under "Today's Reminders".
You will then be asked to confirm that you are ready to enter the
session, and an email notification will send to your provider notifying
him or her that you are ready to start the session.
You can also check-in to a session by clicking into the scheduled session event from your calendar.