In the game, you have an additional source for earning coins and different resources, and it's called “Daily Tasks”.  After reaching a level 15  you will be able to see the “Daily Tasks” in the upper-left corner of the game screen. 
   
When you open that Tab, you can see a bar that shows you the number of days to do Daily Tasks, and the number in the circle is a number of a day you are on right now.
If you successfully completed all required tasks for 5 days, on the fifth day you will get the main bonus! Don't forget to claim the reward!
You can always restart a day you have missed and do all required tasks all over again, OR you can complete each missed task by using your sunrunes.

With love,
Your Farland Team