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If you don't remember you password then click the "Forgot your password?" link. You are required to enter the email address for your account then submit the reset password request. You will receive an email with the link to reset your password.
Log out from the Web App
Click the profile dropdowm and select the Log Out menu to log off OneList.
Log out from the Mobile App
Navigate to the home screen then tap on the top right profile icon to go to the Settings page. Click on the Logout button to log out.