Urgent need of help and direction

I need an input box area, where the user types data into it, or edits the current data that is available from an XML file. I understand this involves ASP, or other technology, but I cannot for the life of me do anything with it. I can happily read from various nodes in an xml file, but for the user to be able to edit and add data is worrying me.

I have read various articles but still cannot get my head around this large step.

Can anyone help me, i.e examples downloads or something in action so I can develop from

Please help.

I have it all setup ready to go, and this is the only real hurdle thats stopping me.

So in essence what I am after is a text area(input field), where xml is displayed. The user will then have the ability to add, delete text inside that input box and click a save button on screen. This will be in a projector, and not online if that helps somewhat.

Please please help, I am not having much luck to say the least.

Thank you for any useful advice, links or samples

Cheers

Trev