The values that you are looking for are all on the Overview Page for the Device that you registered under your Application. If you already have an application created, and a device created you have access to this information in your account. Also you can always just create another device under your previously made application. The fourth photo under step 1 (http://wiki.dragino.com/images/thumb/4/49/TTN_Create_device_3.png/900px-TTN_Create_device_3.png) shows you exactly what you’re looking for on your own account. If you’re using ABP activation you already know that you only need the Network Session Key, the App Session Key, and the Device Address.
While I agree that some of the documentation from Dragino is lacking, out of date, or in some cases just incorrect this set of instructions doesn’t seem to be that bad in comparison. But that might just be my previous experience in programming these devices and also going through Dragino’s other walkthroughs. This could be slightly clearer and probably better organized which I will agree with you on.
If you would like anymore help feel free to ask.