Keep the new password fields empty if you do not want to change your password.
If you have no further interest in this site, or if you're just sick of playing computer games altogether, you can also delete your account.
*: Your e-mail address will not be used in any way apart from logging you in and the initial signup confirmation. In the future I might want to add support for alerts integration, so I've pro-actively chosen for an e-mail address as the primary login method. (you need the Vauban parts? hey- there's an alert on right now!).
**: Giving out your in-game name (IGN) is purely optional. If you specify it, it will be used on the main page to welcome you, and if you choose so, it will also be listed on the members page (opens in a new window).Do note however that IGN's are unique on this site, so if you do not want others to squat on your name, you should really specify it!