How to block someone from Facebook?

You have to unfriend them it should be on the bottom left or right on the page OR since facbook has changed so much try go to the persons page on the bottom left or remove someone OR YOU can Make UR facebook PRIVATE and make people WHO U WANT to see ur stuff by going to UR setting I don't really know how to do the last part but hey GIVE IT A SHOT! GOOD LUCK!

Click at the top right of any Facebook page. Click How do I stop someone from bothering me? Enter the name or email address of the person you want to block and click Block. If you entered a name, select the specific person you want to block from the list that appears. People will not be notified when you block them. If you can’t find someone using this method, try going to the person’s Timeline and selecting Report/Block This Person from the dropdown. If you still can't find the person you want to block, it’s possible that this person no longer uses Facebook or has restricted their privacy settings. Keep in mind that you can control the audience of stuff you share.