@KE2FIS Since you only have 1 contacts you just need to open your logbook and then click on the callsign button in the quick settings bar above the main logging fields (see screenshot). This will update your callsign for the logbook, for new qso’s going forward. Then to edit/update the existing qso you’ll just need to click the edit button on the qso record and do the same thing. (see screenshots below).