How do I block someone from posting on my facebook wall?

[Marilyn]

My sister blocked me from writing on her wall, she keeps posting annoying links on mine. how can i block her from my wall?
block her from my WALL. not block her in general

[Rich]

To block someone:
From your Account dropdown menu, select Privacy Settings.
Next to Block Lists, click Manage Block Lists.
Enter the name or email address of the person you want to block in the appropriate field and click Block. People will not be notified when you block them.
If you can’t find someone using this method, try going to the person’s profile page. You can block them by scrolling down to the bottom of the left column and clicking the "Report/Block This Person" link. Once you click this link, check the "Block this person" box and then click "Submit."

If you still can’t block someone using the methods described above, it’s possible that they have left Facebook or have restricted their privacy settings. You can still prevent them from viewing your profile by adjusting your privacy settings.

[Just Sayin]

Go to her profile and somewhere it should say block person and just click that. But you have to be able to go on their profile

[Aisha Jennifer]

its all under privacy setting