The Daily Bonus is a reward for opening the game every day. You can claim it in the ‘Tasks’ menu located at the bottom right of the game screen. 

Log in seven days in a row to claim all Daily Bonus rewards, and the streak will reset back to day 1 so you can claim more rewards!

IMPORTANT: If you do not log in for a single day during the login streak, the Daily Bonus will reset to day 1.