Hod do you call a method to the veiw?

Lets say I did

script/generate controller home

And in the home controller made a the method..

def say puts "You are here" end

How would I call that method in the index.html.erb?

What do you mean by calling a method of the controller from a view? Controller methods are generally actions that map to urls so you would link to the action in the view, so the user invokes that action when he clicks the link.

If you have not already done so I would recommend working through the Getting Started guide at http://guides.rubyonrails.org/. Also look at the other guides. The railscast videos are also excellent.