Hi! There are two ways for you to access the tutorial. You can simply use either of them :)
1. Go to the game editing page and find the menu icon on the top left. Now tap the 'Help' button, and you will see the 'Quick tips How to use editor' image on the top. Just click it.
2. Go to the explore page and find the search icon on the top right. Then, enter "Editor Tutorial."
Hope this helps. Cheers!