Help with shaders

[Noria]

Hello there ! 

I'm trying to make a modpack just to enjoy a survival world. i wanted to make it a little pretty by adding shaders (two to be precise : Bliss Shaders and Complementary Shaders - Unbound) that i know and like but i can't seem to find them in the options ? do i need to add something more for it to work ? if anyone got even the slightest of an idea i'm open to it :).

 

Thank you very much for the future answers i might get ! 

Edited May 3 by Noria

[Xoroshio]

Make sure you have Optifine installed as a mod.

Go into Options > Video Settings > Shaders > and then click the shader you want

Make sure the shader.zip files are in the shaderpacks folder inside the minecraft folder