In order to play your account on multiple devices, you will need to set your account details and authenticate your account.  You can do this by selecting the menu option from the main menu and then you will be sent an e-mail to confirm your account. In order to complete this process, you must authenticate the account by using the link provided in the e-mail.

If you delete the app without authenticating your account, your current progress in the game will be lost!  Unfortunately, there is no way to recover an account if it has not been authenticated.