Okay. Go to the actual photo and right click. Click on 'copy image URL' and then go to your sig. Before you put the URL, put [img] ,then the URL : [img]http://www.chickensmoothie.com/oekaki/image/image.php?id=794114&size=
large&format=auto&rev=1
The underlined thing you should change to 'gallery'. Then you put [/img]. Don't forget the / . So it will look like this :

. Only without the spaces. Good luck! Sorry if that was confusing. Once you save, (I don't know if that is what you do, since i can't have a sig.) it will apear like the picture on the post.