You can absolutely change your account info, whether it be your shipping information, your email address or the name on your account. When you log in to your account from the store homepage, you can click on your name in the upper right corner, and click on the "Profile" option to navigate to change your profile, account or purchase information.
Purchase: Shipping Changes
You can also change the shipping address on your order through the account settings menu. Once you place an order through one of our stores, we try our best to set your items to ship as soon as we can. This means that often, you are not able to change the shipping information for your order because the vendor has already shipped your item. As a rule of thumb, order shipping can typically be updated on the same day as order date, though it may be possible that your item has already shipped.