Just pop to the ticket office on the day.
Provided you have not breached the limit which is 6 I believe
I have an adult ticket and need a concession - do you want to swap?
Thanks everyone. I'm surprised you can't do it online - thought it would have been more efficient this way.
Thanks.You can do it at the ticket office on the day, or just call Supporter Services and they’ll do it for you (cost is the differnce between the actual ST amount paid for the game and the full adult price for the seat in question) and they’ll email you a print at home ticket immediately.