How do I post a story with a picture?

Choose the "image" option from the "create content" list you get when you hit the "publish!" menu above.

You'll be taken to the image upload page. Click on the "Browse" button to select the image on your computer that you want to upload. Enter the text of your story in the area marked "Body."

You can only post one image with a story this way. If you have more than one picture, create a new image gallery, and then post a link to that image gallery in your story.