Steps 3, 4, and 5 are what you are asking about I guess?
The only thing you need to redeem your coins is the 25 word seed (step 3). The public address is a long string beginning with the number "4". You need it to put into Polo to withdraw to. The private view key, if you're inclined to save it separately (it's derived from the seed so you don't "lose" it, you'd just have to bring the seed partially back online to derive it again), allows you to verify receipt of funds without having to bring your seed online.