where to put image in post bit???

Where to I place an image that will point to the post bit. I have attached a picture. You can see there is only a square where I believe an image should be. You put your cursor on the box and all the games that a user has a high score in shows up. Where would I save an image and what would I name it to have it show up there




--------------- Added [DATE]1240175658[/DATE] at [TIME]1240175658[/TIME] ---------------

Nevermiind...this is an EI issue. There is no image there.