Step 6 – In TWRP recovery, scroll down to “flash zip from SD card” and press the power button to select it.
Step 7 – Press the Power button again and select “choose zip from sdcard”.
Step 8 – Now using your volume keys, navigate to SR3-SuperSU-v2.79-SR3-20170114223742.zip and select it using the Power button. Confirm the installation on the next screen and the installation procedure should start now.
Step 9 – After the installation completes, go to “+++++Go Back” and reboot the phone by selecting “reboot system now” from the Recovery menu. The phone will boot now and it might take about 5 minutes to boot on your first time. So, please wait.
That’s it! Your Galaxy Note 5 is now rooted on Android 7.0 Nougat firmware on your phone! Check for the SuperSU app in your apps list to verify.
To make sure you have correctly installed the above root method and it’s working, verify with Root Checker as given in the link.
Have fun playing with it! If you have any issues, please fire them up in the comments below!