How to connect Buffalo Router to an ISP SkyCable broadband?

I know some of you find it difficult to understand computer technicalities most specially the non-IT users. However, there are also a few inexperienced IT(Information Technology) persons in terms of networking field. Even me at first, is confused with the configuration of connecting the Buffalo router from a Skybroadband internet connection since I am not in the networking field. There is a manual once you bought the router. But the steps may not be as accurate as what will appear on the setup stage. That's what happened to me and thereon I lost it. But because of some friends who is used to this kind of stuffs, I coped with it well. And believe me, the configuration was just too easy if I have known.  So here I am now, sharing it to everyone so that others who have no one to ask with may do it with themselves.

The router that I am using is Buffalo N150 and an ISP provider of SkyCable broadband. This will be an easy step.