yes, it's possible. To do that, please open a note and on the right side of each note, you should find the date it has been posted, a trashcan icon used to delete it and an edit icon.
Unfortunately, due to a temporary bug, the edit icon is not visible at the moment. I have forwarded this to the developers and it will be fixed ASAP.
Sorry for the inconvenience.
the bug has been fixed and the pencil icon used to edit notes is now visible.