It's quite easy. Just complete the tasks on the left side of the screen one by one and don't forget to follow the hints.
While playing the tutorial, you can only do what the game requires you to do. The reason for this is that it teaches you the basics of the game step by step. This information will show you how to progress in the game.
The tutorial is quite short. At level 4, it'll end and you'll be on your own to explore the tropic isles as you wish.