I wanted to try out jeff's smart start manage instead of the phone app but the label has way less digits then what the program asks for
What am I doing wrong?
Not having eyes that can read the contents of the QR code. 
The easiest way is to use the mobile app to scan them into Smart Start, then, if you want, use this app to "manage" them, e.g., disable if you don't want to join the device right now or have an easy way to see if any device that was matches. (Instead of scanning, you can also copy and paste in a code you have saved from somewhere else: another hub, a "vault" app you might have that stores these codes if you do that, etc. A QR code app can probably decode it and help you get the right data, too, but at that point, I'd just use the mobile app.)
If you are just trying to add a device with Smart Start, you don't need it at all, just the instructions for Z-Wave LR (which needs Smart Start, but these instructions work for any Smart Start device regardless of LR support) from here: Add Device | Hubitat Documentation
What you see on the device is the "PIN" part of the DSK, which you'll need for traditional inclusion (if you want to use or the device needs S2). That is what the regular hub interface (non-LR instructions above) will ask you for if you do things that way -- also an option.
Jeff's SS Mgr is not a substitute for using the phone app to scan in the SS QR code - you still need to scan the SS code with the phone app.
Or you could scan it with a QR app and then copy/paste it (or most of it, lol) in Jeff's app. SmartStart has to be better unless you don't have a phone.
Also, don't get hung up on any fields that aren't filled in Jeff's app. The important thing is that there is a listing for it in the Device page and that it works. I uncheck the Enable box after joining.
It's also good for saving a backup.
Some devices provide the entire DSK with the QR code, and some only provide the PIN. You have the PIN only (the ppppp part).
I think if you scan the QR code with some other QR code app, then find the PIN in the result, the digits that follow that should be the rest of it. There will be a bunch of other info encoded in there as well like the default grants and boot mode.
I would recommend scanning it into the hub with the Hubitat app (with the device powered off), then you can manage it from the SmartStart app on the hub. Then turn the device on when ready to pair.