What are you supposed to do with the stories?
I don't see anything that tells you what to do!
There's an arrow at the bottom of the page. Just click the arrow to continue.
It pauses so you can replay the current text before moving forward.
As tech274 says. Also, you can click each word of the story or questions to see the translation. You need to listen and read carefully. Sometimes it will ask you to finish a sentence, or select the correct words from a drop down menu. Other times it will give you a multiple choice to test your comprehension.
I find it difficult when I haven't learned a particular word or verb conjugation (sometimes I have no idea!) but it gives you XP points for every question you get right, and you sort of learn as you go.