It's all a bit daunting at first Muddy, but trial and error is a great teacher
do what Matt says below and get control over your gain and shutter speeds (download Registax 3 too it is better) With Saturn you'll want to be using the slowest shutter speed you can so you can reduce gain to well below halfway. You've got the camera set to 5 frames per second. This is fine, but a bit wasted unless seeing is excellent. For most conditions 10fps is best.
You'r probably best to err of the side of underexposing. What I did with each planet was to take a wide range of exposure settings and then took note of what worked - it's a little different for each planet too!
If you find your stacked images are too bright try repeating but with the Histostertch unchecked.
Anyway, good luck!