Schedule Your In-App Message schedule-your-in-app-message
Send your message now or schedule it for later.
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                  To schedule an in-app message, select Set future date and choose a start date from the drop-down calendar.   
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                  Select a start time from the drop-down.   
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                  The End Date and time are optional; select them from the drop-downs.   
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                  Or, to run the program right now, select Run Immediately. The Start Date fields disappear.   
Easy! Last but not least is the Approval step.