Go to https://reshade.me/ and download the latest update.
Install the Elden Ring Reshade.ini or Elden Ring Reshade With Options.ini file into the Elden Ring's Game directory

Steam Directory: Local disk, Program Files (x64), Steam, steamapps, common, Elden Ring, Game

Epic Directory: Local disk, Program Files, Epic Games, Elden Ring, Game

After loading into the game make sure to press the HOME button located on your keyboard and look for the drop down menu, then select Elden Ring reshade or Elden Ring Reshade
With Options

and your finished!