I need help again!

I'm a lost cause. I need help again :D

Can anyone tell me how you put a picture on the story thing? Allow me to elaborate, you know you go to the story thing to pick a story? Well most of them have pictures next to the title of the story but whenever I post a story it always has a question mark D:

Uggggggh I'm so looooooooooost. But I'm writing a short story for a photo contest, exciting, right?

Anyways I think I reached a 100 words so....

Can you help??? If you can thank you :D If not I totally understand.... :)