I assume that you have installed magisk manager app.If you dont know what is magisk and how to flash it you can goto check out my blog about magisk and If you do have then we may proceed.
Now open the magisk manager app.
Goto downloads and search for Youtube Vanced
and press download and install .
Now wait till reboot option appears.
for everything working normal you can just go and press reboot .
when your device starts goto application manager select youtube and press uninstall updates.
Now see your youtube app new style appears in youtube logo which confrims that you have the module flashed properly.
Enjoy Youtube with new eperience. _x_