Using HObfus is very easy. The idea is to enclose the code you want to obfuscate inside HObfus_begin() and HObfus_end(), like this.
<?php HObfus_begin(); ?> <div id="obfuscate-this"> <span class="obfuscate-me"> <?php echo "I want to obfuscate this HTML code!"; ?> </span> </div> <?php HObfus_end(); ?>
You can obfuscate the entire HTML code, or just parts of it if you want.