How do I set up the Mobile App?
See this article: Where do I turn on the Mobile App?
If your event's Date, Time and/or Venue is hidden, then this screen WILL NOT display the corresponding attribute checkboxes.
This message is what the registrant receives. It contains a link to the Mobile App, which must be clicked from the registrant's smart phone.
It will be necessary to view this email message on their phone so that they can click the link in the message.
If you selected the Remind me to send the Mobile App URL option, you will need to follow the instructions in this article: How do I manually send my event's Mobile App URL?