To use Super user, you must first install the TWRP recovery environment on your device. Go to the TWRP website to download the right one for your device.
Once you have TWRP recovery environment installed on your device, you are ready to flash Superuser and gain root access. See the simple steps below for details:
Step 1: On your phone or computer browser, go to the Super user Root website and download the Superuser zip file. If you download it from your computer, you need to transfer it to your device.
Step 2: Get the device in TWRP recovery environment. To do that, you need to hold down the special buttons on your device. These buttons that you have to hold vary from one device to another. For your specific device, search for "TWRP (Device Model Name)" in Google and find the appropriate button combination. On the TWRP Recovery screen, tap "Install" to begin the process.
Step 3: You should see the option to install the Superuser zip file that you downloaded. Select it and "Swipe to confirm Flash."
Step 4: The installation time of the Superuser zip file in TWRP recovery mode depends on the actual conditions, so please be patient. Tap "Cache / Dalvik" when Superuser is installed, then select "Reboot System" to continue your operation.
It completes the process and you should now see the Super user application on your device. You can test the success of the rooting procedure by installing an application that requires root access. A good example is "Greening" or "Titanium Backup" When trying to use one of these applications, a popup prompt should appear asking for superuser access. Tap "Grant" and when you see a "Success" message, the device is successfully rooted.