How to change XML element by attribute?

Question

C++ / C#

Hey!
Need help.
I need to edit an XML element by its value.
Here's how it should be:
1. Select the element
2. Set the values ​​of its attributes.
3. When you click on the OK button, xml has been edited.
How can this be done?

Here is the editor in which this needs to be done

Answer 1

https://metanit.com/sharp/tutorial/16.1.php