recommend that you test this upgrade procedure on a clone or copy of your Acquia Drupal website in a test server environment before you upgrade your production server.
For information about how to import a copy of your website into Acquia Dev Desktop for testing, see Starting with an existing local site.
The "Update status" module checks for available updates of Drupal core and any installed contributed modules and themes.
is essential reading when going through an upgrade. As you can see, the document only covers the mechanics of an upgrade.
So important in fact that you should go and read it now and come back. Important information indeed, but it doesn't include any of the dozens of things you may need to do even before you get started.
First, you've got to create a custom module which can provide the framework for creating a page.
If you're unfamiliar with how to do this, click here to access a great tutorial on the Drupal website.