Marco,
This is actually a very good request. I frequently don't want to wait until my password has expired before I change it. Would be nice to have a "Change Password" menu option.
The only way I know how to do this at the moment, is to navigate to my username in the "Users" section of the object browser, right-click and choose "Edit". This allows me to alter the current user's password. Either that or use SQL*Plus, or dare I say it "ribbit" T***.
Or am I missing some feature ?
D.