To update the mailing address for your fundraising rebate check, please log into your admin dashboard.
On your admin dashboard you will see a box with your open store and there will be an "Edit" button on the top right hand side of the little box, click on that.
On the next screen you will have some options on the left and the last one will be "Fundraising", click on that.
On the next screen you will see the address it is currently being sent to and you can change it right from there. Don't forget to hit the green "Save" button up top!