CI authentication ???

[eluser]gwood[/eluser]
Just started out with CI few days back and loving it! But there are so much to learn ....

Anyway, here's a n00b question for all your experts. Here's my web app that doesn't have any user account feature. What i mean to say is that users dont need to register and have an account to use it. But as an admin, I need to update stuffs regularly.

Now, I am very much ignorant and confused about the CI user authentication or ACL stuffs (even though I am studying them). I want a login interface only for the admin and create, update, delete to to be available only to the admin. I wanted your advise and suggestion on what approach to use in this scenario. Any example would be much helpful. Thank you in advance.