1. Select the cogwheel shaped setting menu icon at the top right corner on the game screen.
2. Then, select the account protection method at the bottom right corner and log in.
3. Android users can secure their accounts with Facebook or Google Play accounts.
4. iOS users can secure their accounts with Facebook or Game Center accounts.
After You verify your account with the method above, if you reconnect your secured account to the game, you will be able to load the data from the secured account.