Tickets can be upgraded in the RBL online ticket shop in your RBLogin under "Exchange Tickets" from the start of the general pre-sale for the respective match. 

Tickets can also be upgraded on the day of the match from two hours before kick-off at the "Fanhaus" service point (Jahnalle) and at the service centre (stadium forecourt)..

Tickets can only be upgraded via card payment.

Downgrading tickets to a cheaper tariff is not possible.

Only the original purchaser can upgrade the tickets in advance via their RBLogin in the online ticket shop. If you have been forwarded the tickets, you can only upgrade your ticket at the stadium.