Buka menu “Apple”. Klik System Preferences. Klik ikon Network. Klik Advanced. Klik tab Proxies. Sunting informasi proksi. Klik Apply.

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 in the top-left corner of the screen. This option is near the top of the drop-down menu. It resembles a globe in the System Preferences menu. It's in the middle of the Network page. You'll see it at the top of the window. You may first have to click the lock icon and enter your administrator name and password. Change the following fields as needed:   Web Proxy Server - Edit or replace the proxy's URL.  Username - Change the username you use to log in with the proxy (only do this if you chan