NetLDAP

I have read this article : How to Authenticate With RubyNetLdap at this adresse :

http://wiki.rubyonrails.org/rails/pages/HowtoAuthenticateWithRubyNetLdap

I am using a existing LDAP to login into my Ruby on Rail application. Would someone be so kind to explain me how to do. I mean the steps to proceed. I know I would have to install library, create models, controler etc etc....But I have not found any clear and complete documentation.

Thanks again. Gilles TASSE