If you recently got a new device and you want to play your existing game account on it, please follow the steps below.
First, register your existing account with an email and set a password to protect it
1) From your old device, tap to open the 'Menu' dialog

2) Go to 'Account' and tap the button 'Register'
3) Follow the instructions to bind your account with an email address and set a password. 

Then, restore your account on the new device

1) On your new device, download Storm of Wars

2) Launch the game

3) After finishing the tutorial, tap to open the Menu dialog

4) Go to Account and tap the button Restore

5) Enter the bound email address and the password

6) Tap Restore

After the above steps, your account will be safely restored on the new device. If you decide that you don't want to play your game account on the old device any more, please uninstall your game account to ensure the safety of your account.