Also having a Post Slider problem

Hi, And thanks for all your attentive responses. I However can not find the answer to my problem. As in a few posts down I am having a problem to get the post slider to work. I am uploading a featured image to each post and putting the correct Post ID into the Featured Slider Post box but it just won't work. Tried several times and no joy. Please help. URL: http://www.dirtridingmtb.com/ Many thanks