Rails Tutorial Help

I am new to Ruby on Rails, and have been though chapter one of Michael
Hartl Rails Tutorial. I have a couple of questions. But for now I will
just
list the first one. Everything has worked well but I can’t figure out
how
to place the hello action in the application controller. I am working in
Ubuntu 14.04

I figured this out from
http://guides.rubyonrails.org/getting_started.html