Minecraft shaders problem?

I downloaded the Kuda shader for 1.1.5.2 and installed Java, Optifine and Minecraft Forge (I was able to open everything except Forge).

In appdata .minecraft I didn't have a shader folder but simply added one myself.

Now I see shaders in the settings but it is gray and you can't click it.

Do you know what you can do there?

The 1.15 Optifine version is not finished yet, this is just a preview. Shaders only go with 1.14 or lower so far

Pre-View version 1.15.2 does not (unfortunately) support shaders.