Hi, as said on the asset page, the post processing effects are not included, you can search for youtube tutorials about that, there is a lot of these around. Still the blur effect its not the easiest to do, so it may take a while for you to set it up.
Check the channel outerstudios on YouTube, in his video of 2d level follow the particle system part, then reduce the alpha of that particle system, change the color and put it in front of the background elements, and you get it!
