Quite simply via your host account. You specify in your digital calendar, on your host account, when you want to make your campsites available and when not.

To do this, log in with your access data. 

Then click on your profile and select "Bookings". Now you will get to the dashboard. 

On the left side you will now find "Block campsite". 

By clicking on the date field, these fields turn red and are thus marked as vacation, to save click on "Confirm blocking". 

To remove the vacation click again on the corresponding date. 

If you offer several campsites, you must select the appropriate campsite under the tab "Filter bookings".