In addition to the above, note that the prior answers are focused on how to explain to search spiders that the content is identical, and should be treated as a single piece of content.
If you have not already created the duplicate content, do not create it in the first place - it dilutes the effectiveness of the content.
I suggest you start with making your content as useful as possible - this inherently will strengthen its relevance.
Then, while you are busy doing that, start reading the Google blogs to build up your knowledge of standard SEO practices (e.g. not posting duplicate content in an attempt to boost page popularity).
Then, once yo have useful content, look into ways to optimize that content for best/most effective exposure to search engines.