Every note, that you left, on a candidateor on a candidate’s applicationcan be edited or deleted.
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To edit a note, open the candidate or the application, that you left a note on, go to Activities (only when editing notes on an application) and select the All tab or the Notes tab.

OR

Every note you leave will have 2 icons next to it. The edit icon and the delete icon.

After you click on the Edit option, it will open the note editor.