After talking to the Manychat support I had to realize that it was actually not possible to edit or delete notes in a chat/contact. I assumed it must have been a bug, because a notes features without an option to edit/delete seemed to make absolutely no sense at all. Especially, considering that notes lead to a very cluttered appearance of a contact. Anyway, this question thread is to point out this critical issue with notes, raise awareness for this well-needed feature and maybe increase the priority of this topic on Manychat’s roadmap :)