If you go to the stubhub "help" section, they say you can contact them this way:
http://www.stubhub.com/help/?tab=#contactusselect topic: change delivery address
or
If you need immediate help, give us a call. Our award winning customer service representatives are here to help you.
But if your matter isn\'t urgent, please consider shooting us an email instead.
Toll-Free: (866) 788-2482
Weekdays: 5 a.m. - 8 p.m. Pacific time
Weekends: 6 a.m. - 7 p.m. Pacific time