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As indicated above, be sure to click on Download Key Pair and save this file as you'll need it later to SSH to the boxes.  Then you can click on Launch Instances.  You will then get some help finding these instances, but to help you find them later just use the Services >> EC2 navigation approach presented earlier.  You should now see a 3 Running Instances link near the top of the page and clicking on that should show you something like the following (I went ahead and added some friendly identifies in the Name column, too).

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Now we should log into the boxes and make sure they are running.  On the same screen as shown above, select the first instance ("ec2node2.hdp22" in my example) and click on the Connect button which will pop-up another lightbox telling you how to connect.  Here's that in action on my mac.

HW10653:Amazon lmartin$ ls -l
total 8
-rw-r-----@ 1 lmartin  staff  1692 Jun 29 23:46 ec2test.pem
HW10653:Amazon lmartin$ chmod 400 ec2test.pem
HW10653:Amazon lmartin$ ssh -i ec2test.pem root@52.27.108.113
[root@ip-172-31-7-169 ~]# whoami
root
[root@ip-172-31-7-169 ~]# hostname
ip-172-31-7-169

After you check all three boxes, it is time to setup the three 1TB drives we identified earlier for each node.  Good sources of information on this process are here and here.  The following is the play-by-play steps based on the first of the two provided links.  Specifically, the To make a volume available steps from the first link and then Step 7 from the second link.

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