How do I edit my facebook privacy so a nonfriend can't see my wall/have the wall button an option?

[Aditya]

Here is a step to step:

1. Account -> Privacy Settings
2. You will see the "Control Your Default Privacy"
3. Choose Custom / choose Friend (up to you)
4. Scroll down a bit, you will find "Limit the Audience for Past Posts" and then click "Manage Past Post Visibility" and it will change your older posts to the new privacy settings

Something like that?

After that, you can preview it:
1. open this link: http://www.facebook.com/editprofile.php
2. on the right top, below the [home][profile][account] buttons you will see the view as button
3. click it!

I hope it helps Good luck driving away stalkers!