Welcome to the forums David.
DVDDecrypter will automatically make a folder with the name of the video and rip to the largest available hard drive space.
Lets assume you have ripped the dvd to the hard drive using DVDDecrypter, and now have found the folder. Open the Video_TS folder of this dvd video using DVDShrink(click on Open Files). It will do a preliminary analysis of the files. Now click on ReAuthor.
In ReAuthor mode you should see a list of titles on the right side of the window in Shrink. Click on one of the titles that contains the video you want to extract. Hold down the left button on the mouse when you click, then drag the title to the left side of the window. I’m including a picture of this.
Now, click on the Start/End Frame Tool. I’m including a picture showing where this is on the left side of the window in DVDShrink.
Once you have the Start/End Frame Tool going, you can move the sliders to position the exact video clip you want to extract.
When you have the clip set the way you want, click on ok, then Backup. Then browse to the area where you want to put the clip. When you are set, hit OK and it will save the clip.
[Edited for clarity…it had none for a while there…I must be tired, or the brain hasn’t engaged today]