You can add style="text-align: center;" to your <p> tag that is wrapped around the image.
Your biggest problem is not having anything to contain your content.
If you are up to it, hand code this in:
In code view, look for <body>
Add this right after
<div style="width: 960px; margin: 0 auto;">
Next, find the closing </body>
Add this just before
The above will set your framework/layout to be centered while keeping all your content contained within that <div>.
If you haven't coded before then may I suggest viewing Stef's Killersite's Videos. You will find that hand coding will give you the results you are looking for.
This post has been edited by Eddie: 05 February 2011 - 07:20 PM