Click on "My Account" at the top, then "Profile Details".
You can change both your billing and shipping address independantly in your account profile. Simply click on "My Account" at the top, then "Profile Details".
* You can only cancel your order if we haven't shipped it yet.
Make sure you are logged-in to your account, then click on "My account -> Orders". Click on the Order # you'd like to cancel products from. At the top you will a link that says "Request a replacement or a refund". When you click this link, you will be able to select all the products you'd like to cancel from your order. Simply select "Cancel my order" in the reason to the right of the product(s) you selected, then hit the Request button.
Click on "My Account" at the top, then "Orders". You will see a list of all current and previous orders through the rez store.
Click on "My Account" at the top, then "Orders". There you can see all your orders, including their status beside the "Order ID".