How to delete a "friend"?

How does one go about Deleting a so called friend???

You go to your profile and on the left side of the page click the "my Friends" option. On that page it allows you to delete anyone you'd like to.
Also, if you would like to have control who gets accepted to be your friend. You can go into your settings and change it so you are prompted to accept people who add you, as appose to them automatically becoming your friend.

That is very good news! Does this mean that they can't see me anymore too?

no