Press Go to start off, then press the arrows at the top of the screen to move in between the levels. If you wish to repeat a level, press the arrow on the top left of the screen. If you want to carry on, press the arrow in the top right of the screen.
I hope you like this game as it is the most complicated game I have ever created. If you are interested, check the chat for the side story. If I get enough likes, I may release number 2 of Zebra Lost in the City.