Click or double-click the Excel app icon, which resembles a green box with a white "X" on it. This will open the Excel launch page. If you already had Excel open, make sure you save your work by pressing Ctrl+S. You can then skip the next step. It's in the upper-left side of the launch page. This option is in the top-left corner of the Excel window. Doing so brings up a menu on the left side of the window. You'll find this in the left-hand column of options. It's in the middle of the window. Clicking it prompts a pop-up menu. This option is in the pop-up menu. If you don't see this option, first click Enable Updates in the pop-up menu. You should then be able to find the Update Now option in the pop-up menu. This may involve following some on-screen instructions or prompts (e.g., closing Excel). Once the updates finish installing, the update window will close and Excel will re-open. If no updates are available, you won't see an update progress window appear.

TL;DR in Indonesian:
Buka Excel. Klik Blank document. Klik File. Klik Account. Klik Update Options. Klik Update Now. Biarkan pembaruan dipasang.