How to get the underwater distortion working

[imtherealgodot]

PLEASE IGNORE. I HAD A PROBLEM WITH THE PACKAGES IN MY PROJECT.

By the way, love your shaders!

-- Paul

I apologize up front because I know this will have a very obvious answer but I am totally ignorant about alternate render pipelines. I was hoping to test distortion of a submerged texture, but don't know what I need to do to set the full-screen render feature?

Thanks. -- Paul