change to new callsign

Apparently I can only edit the information linked to my callsign, but not the callsign itself.

Can someone change my old call on1apo to my new call ON5APO, or tell me how to do this?

Thanks,
Marc on5apo

[DK8NC]

Will be done soon
73 Helmut

[DK8NC]

Now ON5APO
73 Helmut