You will never be obligated to participate in a study and can leave a study at any time.
If you decide not to participate after scheduling a session, please cancel at least 24 hours in advance of your session. Failure to provide advance notice of a cancellation may result in your removal from the panel. You will not be compensated if you do not attend your session.
If you are in a session and no longer wish to continue, just let your researcher know, and the researcher will immediately end the session. Your decision to leave a study session after it has begun will not affect your compensation, or your future study invitations.