looking for help tweaking custom css

looking for help tweaking custom css

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want to replace /icons/menu.png with <i class="fa fa-microphone"></i>

<img src="<?php echo IMAGEDIR ?>/icons/menu.png" alt="Menu" />

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website link returns "about:blank" when header title clicked instead of going to home page

<div id="header-title">
<h1><?php bloginfo( 'name' ); ?></h1>
</div>