How do I use shaders on Dolphin 3.0?

[Wobuffet3]

Hi, this is my first post and I hope I am welcome here.

Recently, I've discovered that I can alter a game's graphics with the use of post-processing shaders, but I am unsure of how to use them. Google yields no results whatsoever, and I'm tired of searching. I've looked through all of the settings but I've seen no such option to use shaders. I have a shaders folder with a bunch of txt files and stuff, but the readme didn't help me at all.
How do I use them?

[RachelB]

We don't provide support for such ridiculously old versions here.

[Wobuffet3]

Well how do I use them in 4.0? But I'd need to transfer my settings first and I don't quite know how.

[RachelB]

In 4.0, shaders are only supported in the opengl graphics backend. So switch to that, then on the enhancements tab, you'll find a drop down box labeled "Post processing Effect" that you can select from.

[Wobuffet3]

thank you! you are wonderful.