Header messed up

PLease someone help. I made a huge mistake and now the website won’t load.
I have tried to insert ourlogo into header, didn’t save previous entry, hit update and now the whole page is down.
At the moment this is how it looks like:
<div id=”header”>
<div id=”logo”>
<h1>/”><?php bloginfo(<img src=”<?php bloginfo(‘template_url’); ?>/images/amica_voce_logo_colour.jpg” alt=”” />
<?php if (get_bloginfo(‘description’) != ”) { ?><div id=”taglin
</div>
</div>

website is https://www.amicavoce.com

Could you please help to fix this?

Thank you