Tap the Instagram app icon, which resembles a multicolored app with a white camera outline on it. This will open your Instagram feed if you're logged in. If you aren't logged in, enter your email address (or phone number, or username) and password before proceeding. Tap a user's name in your Instagram feed, or tap the Search magnifying glass, enter their name in the search bar, and tap their account when it appears. If you aren't following the person for whom you want to turn on post notifications, tap Follow at the top of their profile page. It's in the upper-right corner of the screen. A menu will appear. This option is in the menu. Doing so will turn on post notifications, meaning that you'll receive a notification on your phone whenever the account in question uploads. You can disable post notifications by going back to the profile, tapping ⋯ or ⋮, and tapping Turn off Post Notifications in the menu.

How would you rephrase that briefly using Vietnamese?
Mở Instagram bằng cách nhấp vào biểu tượng ứng dụng. Vào hồ sơ của ai đó. Theo dõi người đó nếu cần. Nhấn vào nút ⋯ (iPhone) hoặc ⋮ (Android) ở góc trên bên phải của màn hình. Nhấn vào tùy chọn Turn on Post Notifications (Bật thông báo đăng bài) trong trình đơn trên.