I updated the link above, but instructions can be found in this thread: https://forums.storm8.com/showthread.php?59955
With RS, you may have to navigate the Game Centre and/or Cloud, so please read through the first page of the thread. If you get stuck, Support can help you transfer your device. Make sure you know what your gem balance and coin count is so that they can identify/verify your account.
Support: https://support.storm8.com/hc/en-us/requests/new