There are Two Way
First
Second :
Second way is Open Your Profile and Select Activity Log.
Scrool slecet More and then select Firends.
Scorll Down and select Undo Uoption.
Facebook Profile
Hide your Facebook Friends List
News Feed In Facebook
Groups In FaceBook
How We Delete an Album on Facebook
Privacy settings for my photo albums
Change Your Profile Picture on Facebook
Edit your Profile on Facebook
How Facebook Show Description From Your Post
Create a Unique URL for Facebook Page
How we delete all the messages at once at facebook
Delete All Facebook friends at once