To add the additional fields to the Add attendee screen,

Go to the V4S Mobile Apps tab and click the App Name for the App Key which is used by events user to login to the V4S Kiosk app on the device. Click the config button, and click on V4S Kiosk tab and go to Attendee sub-tab. Select the fields which should be displayed on the device at the Add Attendee screen and click the save button and save it.

The fields selected in the Contact and Attendee fields are displayed on the device for the add attendee screen.