What was the object you were observing? I notice you are using a gain of 133. Depending on what you are looking at this may not be high enough in combination with 7 second exposures. You should be using a higher gain of 300-350 until you are sure you are on target and then adjust gain and exposure time until your happy with the image you are getting. The live stack tab shows your are stacking exposures so that’s good. You should go to the histogram tab and adjust the histogram once you confirm you are stacking. This will really help bring out the faint details in your image.
Sharpcap takes a little while to get used to. There’s a lot of info and settings to digest at first but after a few sessions it really is an easy program to work with. Keep at it and ask questions.
As roelb suggests, if you are just looking at a sparse area of sky with just a few stars you will not see much of a difference with stacking. Try a bright object like M42 to start with.
Edited by neaptide, 09 February 2018 - 06:31 PM.