[myMag Theme] image won't display

hii guys, i use myMag Themes on my WordPress 3.0.1, i was follow instruction to use feature like slide, thumnails, etc on that themes

i was set permission on myMag theme directory to 777, i upload images and set as ‘feature image’ on my posting.

when publish and i see my post on the front page, the images can’t show! i confused to find way to solve them.

can you tell me how to display my image on it. check this out on http://www.doudompu.com