This is required to initialize a group FaceTime call. Press on the new message button in the corner of Messages, and add contacts to the group chat. Make sure that all the numbers appear in blue.  FaceTime only works with iMessage.  Wait for everyone to join.  You will see their faces. On iPhone X or later (excludes iPhone SE (2nd generation)), tap on the star, then choose the Memoji you want to use. You can also tap the star to draw on the camera, add stickers, and more. Tap on the triple dots to expand additional options for your FaceTime call. You cannot end the call, but you can leave the group call by tapping on the x at the bottom. Once everyone has left, the FaceTime call will end.

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Write a summary of the previous text in Indonesian:
Pastikan Anda dan teman menggunakan iOS 12.1 (dan setelahnya) atau macOS Mojave dengan pembaruan terbaru. Mulai obrolan grup di Messages. Sentuh tanda panah di grup. Pilih “FaceTime”. Nyalakan Memoji. Balikkan kamera, matikan mikrofon, pilih lawan bicara, dan ubah sumber suara. Tinggalkan panggilan FaceTime.