Multiple H1

Hi, I would like to optimize SEO and 2 H1 are present on pages:

<h1 id="site-title"><a href="http://www.mesureo.com/" title="" rel="home" target="_blank"></a></h1>
[...]
<h1 class="entry-title"><a href="http://www.mesureo.com/sonde-chlore-libre/" title="Permalien vers sonde chlore libre" rel="bookmark" target="_blank">sonde chlore libre</a></h1>

How can I keep only title page as H1 ? Other question, I would like to keep only text without link and style. Does it possible? Thanks