Viewer Node doesn't show up So I am watching a tutorial and I am supposed to create a viewer node to connect it with a fresnel. I searched through the internet and everyone is saying that I only have to press Shift + Ctrl + LMB  but no matter how often I try to press those buttons, nothing happens. 

It should pop up, right? I don't know what to do anymore. Cause apparently this is important for the next steps I have to do.
You need the Node Wrangler addon.

Just enable it in preferences, and you're done.
Preferences->Addons and click the checkmark.  

Remember to Save Preferences.
Restart Blender.
Done.