While you’re always free to modify your personal information, changes to the items in your order will not be permitted. If there’s something you forgot to purchase the first time and the item is still available, simply complete a new purchase.
You can log into your Eventbrite account to change account information. Click here for more info: http://help.eventbrite.com/customer/en_us/portal/articles/430100-how-to-update-your-ticket-registration-information
If you require assistance with your account, please contact Eventbrite customer service at 1-855-286-9808 or online at https://www.eventbrite.com/contact-us/