The main reason there isn't much info on the diad anywhere is you use it 10 hours a day. Generally you'll have it down in a week. That said when someone isn't home to sign.
scan package, big arrow down. (ring door bell, start filling out service cross)
No one answers, now you hit the non delivery button, then press not in 1,2 or 3 whichever attempt it is.
The diad will them prompt you to scan the info notice.
Once you've done that you can stop complete it.
If you have multiple packages you'll have to mark each one not in 1 or whatever. Also if you have a normal package and sig required pacakge, mark the sig required one not in, then driver release the other one.