AccountKiller
Log in, then go to http://www.friendster.com/account/settings
Next, click "Deactivate". Enter your password to confirm and follow the instructions on screen.
Publicly visible text/images often aren't properly deleted even when you succeed in deleting an account. Try editing or deleting them manually before deleting the account itself. If you're unsure what happens to your tracks you can always contact Friendster and ask personally. By the way, deletion requests don't necessarily mean your data will actually be deleted (e.g. due to legal obligations).
If you signed up for Friendster using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Friendster. Click the icon below to find out how.