How to enable post-processing in unity?

Question

3D rendering

In general, there was a need to create a shader for unity, I found a post about this on habré, downloaded a ready-made scene with a shader and it turns out that post-processing effects do not work for me, that is, I can make a shader, but it will not give such lighting as shown in post, tried to reinstall the add-ons in unity, create a Post-process volume manually, but nothing happened. Am I missing something or is it just outdated? We are talking about this post: https://habr.com/en/post/479302/