for your story, i'm assuming? well, i see that you made your own layout. so go back to where you made your own layout and click 'story title'. once you click on that go to 'padding' and in the first box change the number. generally it will be higher like inbetween 100-400.. depending on how big your picture is. and that's how you get a picture.
hahah. it's totally fine. i was the same way when i first started you'll be a professional before you know it. i mean, i'm making layouts now for profiles and stories, now.
i just re-read my last comment and realized i said 'box' about ten thousand times in the same sentence... lol. woops.
haha. i told you it's fine. i'm pretty much the one that kind of made you come onto mibba.. lol. if you need tiny pictures to put into that box i have some for you to use.. or if you want to use it for your avatar :)