You can use this page for managing your contact and privacy settings on your own.
You will need either a Database account (if you have one, log in first), or your most recent Personal Security Code (PSC). (A PSC is a unique string of numbers, digits and dashes that gets issued to you at each General Election - you should find it alongside the most recent ballot you got emailed.)
If you do not have a past PSC to enter (because you are a new citizen, or because you cannot find one), you will need to contact the Chancery (by email to talossachancery@gmail.com) to get your settings changed manually.