Themeology/Nivo Slider

http://www.alexandrakatherine.com/

I am trying to add other images to the slider. For some reason other images won’t load, only 1. Using the featured_slide_img custom field and a URL only seems to be working with the most recent post I add.

I have tried adding another custom field to the same post as well as adding another post. The slider continues containing only 1 image.