The Sims 4 folder missing

there's no manage button

Then try the following

1. Open EA app
2. Click on Sims 4 in your library
3. Click on Manage and Properties
4. On top you should see the install location of the game. You can click Open Folder from there (mine is on a different folder so that's not where yours will be but that's where you'll find the installation location)

im trying to add shaders in my game

HI san6613​ 

it's probably installed on another drive but there's very little reason to change something in the installation files

You're probably looking for your user folder that has your saves and stuff ? That should be in your documents folder.

If you do need help finding your installation files, let me know.