Enable SMS Sign out reminders
To setup the system to send SMS sign out reminders, first click on the “Configure System” section of the dashboard and then “General Settings“.
Next click on the header labelled “Overall settings”.
You will be presented with a list of different settings to change and there should be one titled “Send an SMS reminder to visitors to sign out”.
Change this setting to the time you would like visitors the reminder to be sent and then click the “Update changes” button at the top of the screen.