To edit an XML file, you will need to use a text editor. Some text editors will have specific features for working with XML files, but any text editor can be used.
When you open an XML file in a text editor, you will see the tags and text that make up the file. You can edit the text between the tags to change the information in the file. Be careful not to delete or change any of the tags, as this can make the file unusable.
If you need to add new information to the file, you can add new tags. Just be sure to place them in the correct spot in the file, and to use the proper format.