Welcome to the ODK forum, @steeve_kevin! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. Thanks for adding your profile picture. It helps build community!
You cannot directly edit and update a CSV using ODK. But there are workflows that allow you to use existing data. See https://docs.getodk.org/data-collector-workflows/#encounters-with-known-entities for some descriptions of different options.