Article in English: It's the magnifying glass icon in the top-right corner of the screen. Doing so will bring up the "Activity Monitor" app. Doing so will open the Activity Monitor program, which will allow you to view your Mac's current RAM consumption. It's a tab at the top of the Activity Monitor window. You'll see this option at the bottom of the page. The "Physical Memory" number here shows how much RAM your Mac has installed, while the "Memory Used" number is how much RAM your Mac is currently using.

Summary in Indonesian:
Klik tombol Spotlight. Masukkan Activity Monitor di bilah pencarian. Klik Activity Monitor. Klik tab Memory di bagian atas jendela. Perhatikan entri Memory Used di bagian bawah halaman.