Open the URL for your Planner in a browser

Go to the Administration tab

In Administration, go to the Organization tab

In the Organization tab, locate the address field and fill in an address (see below)
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To verify the address, hover the address information icon (see below)
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Go to the Settings tab
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Click on Email in the left side of the settings overview and find the Visitor Boarding Card section (see below)
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Click Edit for a specific location
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In the Visitor Boarding Card editor, check the Active checkbox, select the time prior to the meeting by which you want the external attendees to receive the email, activate the map and finally fill in general information and information related to emergencies (see below)
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Click Save to save the Visitor Boarding Card for that specific location. You're able to define one Visitor Boarding Card for each location
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Now the Visitor Boarding Card is active
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In order to set whether Visitor Boarding Cards are to be sent by default, go to Meeting settings in Settings
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Under Notification, check Send Visitor Boarding Card by default checkbox (see below)
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Don't forget to press save