So what is your problem precisely?
Can you start TWRP? Hold "Volume up" while powering the Note 4 on. It should boot into TWRP.
You can start TWRP but the touchscreen shows no reaction? That's bad luck. You might be unlucky and TWRP does not support your digitzer. Check this thread for information:
https://xiaomi.eu/community/threads/stucked-on-twrp-screen-please-help.34118/
You can use an USB-OTG cable to connect a mouse and operate TWRP with it.