To view an app on your mobile device that has been marked as private, you will need to enter an email address that matches one on the app's private list.
If you enter an email address that is not on the list, you will not be allowed to view the app. Contact your app creator to add you to the private app list.
If you are already logged into Yapp with an email address on the white list, the app will automatically download.
If you are already logged into Yapp with an email address not on the white list or a Facebook account without an email, you will need to logout of Yapp and log back in with the email you were invited with to download the app.