Hi shagjakia and welcome:
I’m not sure if you are asking how do different people use the programs or how do you (meaning shagjakia) use the program.
There is a Guides forum here and one of them is for DVD decrytptor with Shrink.
You can also look at the tutorials found on dvdfab’s website.
I am not conversant in this program but there are many knowledgable and friendly members who I am sure can help you. The above should get you started.