So, the way I did it is in now way the correct way but hey, gets the job done.
For others who are starting out I simply copied the code from the completed registration code section into a new section which then creates a new entity and then saves . Like above the passowrd tells the createuser logic to reset the password instead of creating a new user.
I am so new to WPF and Silverlight that I couldn't figure out how to easily load and update the user in the UpdateUser logic so I didn't bother.
I couldn't find an easy sample on how to load and update a record in a silverlight entity manager. And the userinformation really isn't an entity so with the short time I had, I couldn't figure out how that would work.