Missing shaders tab

Im trying to get shaders on forge 1.20.1. When i use sodium + iris there is the changed gui, but there isnt any ,,shader tab,, where i can turn on the shaders. I tried using rubidium and oculus + iris but it gives me this error or error 1 and keeps crashing. Same happens with optifine (error code 1). Got any idea how i can use shaders on forge in 1.20.1?