How to centre a header image

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First of all, I apologise if this is in the wrong thread or is such a stupid question, but I'd really appreciate some help. I'm very new to coding, and here's my predicament..

Here's the part of the code I believe I'm having trouble with:-

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

	

     <img src="URL" />

     <meta name="description" content="{MetaDescription}" />

     <meta name="if:Show description" content="1" />	

     <meta name="if:Show search" content="1" />

     <meta name="text:Disqus Shortname" content="" />

Now I want to centre the image from tinypic, but every tag I try does nothing!
Here's what it is for and what it looks like at the moment > http://diaboli-advocatus.tumblr.com/