Article in English: To ensure that you don't cause any damage, remove the battery as well (if possible). Make sure to unplug the laptop from the power adapter. Most laptops allow you to swap out RAM through a panel on the bottom of the laptop. You will need a small Phillips screwdriver to access this panel. The panel is often marked by a small image of a RAM module. You may have to remove multiple panels in order to access the RAM.    Anytime you work inside a computer, you risk emitting an electrostatic discharge that could damage your components. You can reduce this risk by wearing an anti-static wriststrap, or by grounding yourself before working in the laptop. Touching a metal water tap will ground you. Most laptops only have one or two slots for memory modules. You may need to remove your existing RAM if you intend to upgrade. You can remove the RAM by detaching the latches on each side, which will pop the RAM up at a 45 degree angle. This allows you to pull the module straight out. Insert at a 45 degree angle and then push down to secure. Make sure that the notches line up. If you try to install the RAM upside down, it will not fit. Do not try to force the RAM into its slot. Not all laptops need pairs of RAM modules. Check your laptop's documentation for details.    Once you have installed your new RAM, close up and secure the RAM access panel. Turn on your computer and allow it to boot into your operating system. You may be prompted to continue due to your new RAM installation. If your computer runs into a serious error at this point, the RAM may be improperly installed, or there may be an errors with one of your new modules. See this guide for instructions on testing your RAM modules. Open your computer's system information to verify that the RAM was properly installed and is being used. Double-check that the amount is being displayed correctly.  Windows - Open the System Properties window by pressing ⊞ Win+Pause. Verify your installed RAM in the System section. Mac - Click the Apple menu and select "About This Mac"....

Summary in Vietnamese:
Tắt laptop. Lật laptop lại để bạn có thể tiếp cận phần đáy. Tự nối đất. Lấy RAM ra (nếu có). Lắp đặt RAM mới. Lắp lại tấm bảo vệ RAM. Khởi động hệ điều hành. Kiểm tra xem RAM đã được nhận dạng chưa.