To play on another device, make sure you have saved your account first (How to save my account?).
After installing the game on your new device, login to the account (Game Center, Google Play or Facebook) you have linked your Super Spell Heroes account to.
The game will ask you if you want to restore your previous account. Tap 'OK' to load your account and continue to play.
In case you missed to restore your account, just re-install the game and repeat these steps.
Please note: you cannot play on two different devices at the same time.