Once your loader is installed, follow these steps to activate the shaders:

: Both loaders require Java to be installed on your computer to run their installers. 3. Add the .zip to Minecraft

Shaders cannot run on "Vanilla" Minecraft alone; you need a loader to act as a bridge.

using the new loader profile (Iris or OptiFine) in your launcher.

Navigate to → Video Settings → Shader Packs (or "Shaders" in OptiFine). Click the Open Shader Pack Folder button.