Unfortunately it is not possible to change/upgrade your tickets.
It is not possible to exchange purchased lockers, add foltables, dixies or other upgrades, or upgrade from a Saturday ticket to a weekend ticket.
In addition, approximately one week before the festival, it is no longer possible to buy beer or coins vouchers online.
However, it is possible to change the information on your ticket. This can be done via the ticket transfer: https://personalize.paylogic.com/ticket-transfer?event=874d8a264fe246f3a96bef0868322696