...
Go to Sharing Settings and config/add the following:
...
Account Sharing Rules
Go to Setup > Sharing Settings > Account Sharing Rules > Click New > Label = Sign In Checkin/Out Kiosk > tick Guest user access, based on criteria
...
Asset Sharing Rules
...
Go to Setup > All Sites > Builder > click Gear/Settings icon (below the Page Structure) > click Check in/out Kiosk Guest User Profile > Object Settings > give permission to the following objects and fields
...