How Can I Populate Data In A One-to-one Relationship

Here is what I have and (somewhat understand).
 
I’m using Visual Web
Developer 2005 Express Edition and have setup my application to use form authentication
(which automatically creates the ASPNETDB.MDF file with several default tables
and views).
  I’m using the CreateUserWizard
which is fine…but I need to collect additional information like (firstname,
lastname, address…and on..).
  What I’ve
done.
  I’ve created a tabled named
UserProfile and set UserId as the primary key (uniqueidentifier).
 

 I then setup a 1-to-1 relationship
between aspnet_Users and UserProfile (which I think is correct).
  On my UpdateContactInfo.aspx page (where
users go to update their personal information) I use a hidden label control
(UserValue) to receive the UserId during the page_load event as below:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        UserValue.Text = Membership.GetUser().ProviderUserKey().ToString()
    End Sub
Now with the UserID available I need to populate the
UserProfile table with the UserId, firstname, lastname, address of the
currently logged in user.
   How can I do this and am I on the
right track..?