How to secure a page??

Hey I'm installing a shopping cart on one of my sites and I want to be able to secure it any ideas? I tried a plugin but I get a strange message saying something like "this page is redirecting you to etc..". I just need a couple pages secure like the check out and the confirmation of order pages.

Get a dedicated IP for the domain if you don't have one already, and install an SSL certificate. The pages you want to secure must be called using https protocol (hypertext transfer protocol secure). That will make the exchange of info secured over the encrypted protocol (and your users will see the lock icon/valid cert. info.
Hope this helps .

Thanks for the detailed answer. I was thinking it could be easier like a plugin or something like that.