i've put the wrong ICAO code in, how do i change it?

Go into my sightings and click on the view button for the aircraft in question, there is an edit link you can then click on and change it.

Jack,

As Steve has said you can easily edit your data.

1. click on the 'My Sightings' in the black area at the top of the screen on the right-hand sight.
2. if your sighting with the wrong ICAO code isn't visible you can scroll through your pages (bottom right of screen) or use the search box.
3. when you see your listing click 'view' on the right-hand side of the listing to bring up your record.
4. click the 'edit' field (next to the registration/type header)
5. click in the 'Airport' field and amend as required.
6. remember to 'save' the change by clicking on the 'update sighting; box at the bottom.

Hope it works for you.

Kind regards, Brian