It's very easy to navigate any story!
The first thing you may notice is the navigation bar. It is sticky and will remain at the top of your screen as you scroll down. The top half has the story title and navigation buttons, while the bottom half has the current chapter and page.
Every story has a table of contents. To view the table of contents, all you need to do is click the hamburger button at the top of the story, next to the title.
After clicking, the table will appear and you can navigate directly to any page in the story by clicking first on its chapter and then the page of your choice.
Or you can navigate a story by progressing the page forwards or backwards by using the controls in the top right and left corners or by using the arrows on the side of the story.