Scholar Theme Slideshow

1) When there is an image in the post already, and the slideshow has grabbed it, how do I get the slideshow to “ungrab” that image.

Right now, what is happening is that I am going in and setting different graphics to be the “featured image” of the posts, and the new graphics are not appearing in the slideshow.

2) I selected a slideshow background color and text color here:

and those are not showing.

3) What is the best size for images in the slideshow?

The URL is: