Open up index.php and replace this:
<?php if ( of_get_option('block3_textarea') ) { ?>
<div class="midrow_block">
<div class="mid_block_content">
<h3><?php echo of_get_option('block3_text'); ?></h3>
<p><?php echo of_get_option('block3_textarea'); ?></p>
</div>
</div>
<?php } ?>
with this:
<div class="midrow_block">
<div class="mid_block_content">
<h3><?php echo of_get_option('block3_text'); ?></h3>
<p><?php echo of_get_option('block3_textarea'); ?>
//Add your google map code here.....
</p>
</div>
</div>