Sign into your Battlbox account, and then click the orange EDIT/VIEW button, click the change subscription button. Select the new level you desire, and then press update subscription in the bottom right hand corner.
After pressing update, if you have a recent unfulfilled renewal, you will be prompted and given the choice to upgrade this box as well. If you accept, you will be charged the net difference from the previous tier to your new tier. Future charges will be for the new tier level
If you follow these steps above; however still have questions on the upgrade Please feel free to reach out via email to firstname.lastname@example.org and the support team will finalize this request for you.