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It’s a green icon with a white speech bubble that says “LINE” inside. You’ll usually find it in the app drawer. It’s near the top-right corner of the screen and looks like a person’s head and shoulders with a “+” symbol. It’s the last icon in the row at the top of the screen.  LINE will display the person’s name and profile image (if applicable) at the bottom of the screen. It’s the green button beneath the person’s username. This user is now added to your contacts list.
Open LINE on your phone or tablet. Tap the new contact icon. Tap Search. Select ID or Phone number. Enter the username or phone number of the person you want to add. Tap Add.