Featured Slider does not work

Hi, my feature slider does not work. I tried to have a slide show of 2 photos, but only this appears on the screen: http://www.aussiebuschleben.net When I change to post slider there is a bit of the post text and a small background photo. What am I doing wrong? What exactly do I have to fill in the image and link field? Thank you so much for your help. Irina