Hi,
You can adjust the callsign attached to your user account in the "My
account" view,
http://aprs.fi/ -> below "Other views" there's a link "My
account".
You can also rename web stations created through the iOS app, instead of
deleting and recreating, in the "My stations" view,
http://aprs.fi/my/ -
the stations appear in the list "My web stations", click on Settings.
- Hessu