Tap on the Name of your account. That opens up a dropdown. One of the options will be 'Accounts'. Tap that to go to the Accounts Page.
That's how it worked in Nook Tablet and I'm guessing it's the same in HD.
Thanks for the suggetion 5, but the email app on the HD+ is different. What you described is the UI on the NC. On the HD+ there is a gray bar across the top. In the middle of the bar it says Mailbox in large, bolded letters. Underneath that in small letters is my email acct name. Tapping anywhere on the bar does nothing.
There may be different ways to do it, but you can do it through the main "settings" menu, "applications", ""email" and there should be an "add account at the bottom of the page"