Hi, Do you mean the actual picture of the item you're selling? That's the "Gallery" and costs you extra, although I wouldn't sell without it. There's a place on the template to check it and it'll go there. It will show at the bottom how much it is; I honestly can't remember. They just raised the price - maybe 60 cents? Less? Somebody correct me if I'm wrong.
If you mean how to force the little green camera, tell us and somebody can point you to it, although if you have a picture IN your listing it should automatically be there.