You will be prompted on your first bootup to the new drive for the media to restore onto your upgraded SSD device. You should have created that in the step 4 above before you actually upgraded your hardware. If you did not create the backup you will have to reinstall your original SSD and start over. I told you to read all the steps didn't I ?

The images show you where to look to see if your upgrades are working in the chromeos system URL. Just threw this in FYI

If all is well, like my screen shots indicate, you can install crouton and ubuntu and virtualbox and do real computing with your chromebook now!!!!!