Why is my equirectangle image not adding ?

Yeah I agree . Why don't join the crew so you could teach me

Hi, In cg cookie where did you learn this?                                                            

I don't remember, sorry...

It's like with most of what I know, a combination of: watching loads of tutorials (not only on CGCookie), using Blender everyday (for about 6 years now) and learning from questions asked here (part of the answer I didn't know, until you asked the question...).

Some things just take time to understand; for instance, it took me a few years (I think) to understand something simple and basic, like, why you sometimes use a Mix RGB node and other times a Mix Shader. (I should have asked that on the Forum!)

But by making mistakes, you learn, just don't give up;)

That is a great advice