Follow this tutorial if you are having trouble
in installing shaders:- 
https://discord.gg/QsuvgHbmkC

NOTE FOR ANDROID USERS:-
 
• After activating shader please restart
the game otherwise sky won't work,

•  Currently BetterRD doesn't support version
above 1.21.20+ so you will have to manually
replace files of game[ONLY ISSUE ON PATCH
APK And ONLY FOR ANDROID USERS] 