This is simplified enough , any newbie that have further questions can ask ,I'm sure many people are here to respond approximately.
It should also be noted that the 16Digits code should be kept safely
I know you're trying to help but it is noted already, I guess you didn't read all of it. Secret key/address key is the 16digit code what you want to be noted. BitMaxz already mention it .
Don't forget to backup secret key because it's very important when you lose your device. Make sure it's well written on the piece of paper or make a backup copy in your USB device or PC.