Click the help button and it will (should) take you to a website that will walk you through everything (with screen shots)
Anyway - I have Nero and I am not on my PC with DVD Shrink on it - so this is a best guess.
1. Insert the disc you want to backup
2. Click "Open Disc" (as you normally do)
3. Wait for it to scan the disc
4. Click "Reauthor" from the menu
5. You will now see a list of all the files on the DVD - it will be broken into the trailers, intro, FBI warning, menus, extras, etc.
6. Click once on the largest file listed and verify that this is the movie by using the preview box.
7. Drag it from the right side of the screen (setup side) to the left side of the screen (burn side)
8. At the TOP of the right side window, there are two tabs. One tab shows all the different videos. When you have picked a video to burn, you can click the other tab which will show you the associated audio formats included with the video.
9. Click that tab!
10. You will see different audio formats (English AC3 Stereo, English Digital DTS, French AC3 Stereo) These formats vary depending on the disc, but if you know DTS and AC3 are there, then you will see both of them listed. Make sure the check boxes are clicked for the audio formats you want to include. It is possible in the 'program options' to change the defaults to include the DTS soundtrack, but I don't remember how I did that.
11. You now have your movie (only) ready to be burned with DTS & AC3 audio.
12. Click the 'BACKUP' button.
When the burn is complete, when you put the disc in your player it will start the movie. No menus, no waiting, no commercials, nothing! Just the movie.