Masuklah ke Facebook di tablet atau ponsel. Sentuh menu ☰. Gulirkan layar ke bawah, lalu sentuh Settings & Privacy. Sentuh Settings. Sentuh Security & Login yang terdapat di bawah heading "Security". Lihatlah daftar log masuk yang aktif. Sentuh ⁝ yang terdapat di samping sesi yang ingin diakhiri. Sentuh Log Out.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
If you left yourself signed into Facebook on another device (e.g., on a school or work computer, a friend's phone), you can sign out of that session with this method. You'll usually find the Facebook app on the home screen (iPhone/iPad) or in the app drawer (Android).  You'll need to sign into Facebook using the same account you want to log out remotely. If you're using someone else's phone or tablet, log out of their account using the steps in this method, then sign in with your own account. Yo