Updating XML document in VB .NET

[Baz]

I am trying to write a program to perform a simple update to an XML
document. Unfortunately I can find no example on the web, all I want to
do is add an extra node.

Here is the code I have written to open and scan the document:-

Dim lXML As New Xml.XmlDocument
Dim lXMLnode As Xml.XmlNode
Dim lXMLnodelist As Xml.XmlNodeList

lXML.Load("C:\Program Files\Philips\ProntoEdit
NG\PCFs\ConfigEdit.xml")
lXMLnodelist = lXML.SelectNodes("*")
For Each lXMLnode In lXMLnodelist
Debug.Write(lXMLnode.Name)
If lXMLnode.HasChildNodes Then
Debug.Write(lXMLnode.FirstChild.Name)
' Code to be added here to add node

End If
Next

I am a COBOL programmer of 15 years and have recently learnt a
reasonable amount of VB and I am now trying to learn VB .NET.

Help in solving this issue with a simple example and also details of
good plain speaking resources would be greatly appreciated.

Baz