Jalankan Facebook Messenger pada iPad atau iPhone. Sentuh orang yang ingin dikirimi pesan. Tik pesan yang ingin dikirim, lalu sentuh tombol Send. Periksa status pesan.

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?
It’s the blue and white chat bubble icon with a sideways lightning bolt inside. You’ll usually find it on the home screen. Messenger is set up to automatically show you when someone has read your message. This opens a conversation with that person. It’s the blue paper airplane icon at the bottom-right corner of the message. A blue check mark in a white circle means you’ve sent the message, but the person has not yet opened Messenger. A white check mark in a blue circle means the person has opene