Modify an XML document

Okay, I have a program written in Delphi 6 that opens an XML document and can view content.  What I want to do is change the content, but I have no idea where to begin.  I've looked all over and cannot find a simple answer.  I'm hoping I don't have to use constructs, xsl or all that other crap.  It seems like if I'm getting a "node" I should just as simply be able to edit it.  Anyway, here's the XML file:

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<?xml version="1.0"?>
<Users>
   <Character>
      <name>Scott</name>
      <password>test</password>
      <gender>male</gender>
   </Character>
   <Character>
      <name>Aeolus</name>
      <password>test</password>
      <gender>male</gender>
   </Character>
   <Character>
      <name>Bob</name>
      <password>pwforbob</password>
      <gender>male</gender>
   </Character>
   <Character>
      <name>Fred</name>
      <password>fredspw</password>
      <gender>Male</gender>
   </Character>
</Users>
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and here's the code:
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procedure TForm1.FormCreate(Sender: TObject);
begin
   XMLDoc.LoadFromFile('c:\project\server\users.xml');
   XMLDoc.Active := true;

   StartItemNode := XMLDoc.DocumentElement.ChildNodes.FindNode('Character');
   CharNode := StartItemNode;
   repeat
    ListBox1.AddItem(CharNode.ChildNodes['name'].Text,nil);
    CharNode := CharNode.NextSibling;
   until CharNode = nil;

end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   CharNode := StartItemNode;
   repeat
    if CharNode.ChildNodes['name'].Text = TListBox(Listbox1).Items[TListBox(Listbox1).ItemIndex] then
    ShowMessage (CharNode.ChildNodes['password'].Text);
    CharNode := CharNode.NextSibling;
   until CharNode = nil;
end;

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As you can see, it gets all the <name>'s and pupulates a listbox.  Then, if you select one of the names and click "show password" it shows you the <password> from that <name>.  What I want to do is add an EditBox and another button and be able to change the <password> for the selected <name>.  I have no idea where to begin.