You can switch to another account by first logging out from your current account. To do that, please follow the instructions below:

-  Open the game and go to the home screen.

-  Click on the "Options"  menu at the top right of the screen.
- Select the "Account Settings" tab
- Click on the "Logout" button and click on "Confirm": 

- After this you will be able to login with a different account upon restarting the game.