I would like to add a anew folder/page to the site and currently I have a RoR application running; can you please help me how to do this? Thanks

It hard to tell if this post is a joke or not.

The getting started guide covers things so basic:
http://guides.rubyonrails.org/getting_started.html

It's probably for a friend!

A new folder? As in a directory?

I'm no jeenyus, but if that's the case, then you need to:

1. Open your File Manager
2. Browse to the 'place' where your application is
3. Right click the handheld input device (mouse)
4. Select the option highlighting 'New Folder'
5. Type a name for the new folder you are about to create
6. Press Enter on the keyboard
7. Smile, because you've just created your own folder!