Open the Facebook app or go to Facebook.com
Tap/click your profile picture (or menu)
Scroll down and tap/click Settings & privacy
Tap/click Settings
Scroll to find and tap/click Accounts Center
Tap/click Password and security
Tap/click Where you’re logged in
Select the session/device you want to log out from
Tap/click Log out
To log out everywhere, tap/click Log out of all sessions
Confirm when prompted