Help coding for wordpress

I need some help with on page optimisation but my problem is finding the code I need to change

For example there are no h1 / h2 tags and looking on the source code or firebug or inspect elements it hows the headings are coded as cufon. So I go to the files in wordpress to look for these tage but they are not there, I’m assuming they are changes into some kind of php code or shortcodes.

Here is the website Dog Bath, Grooming equipment, Grooming Supplies

So how do I find the cufon tags and change them to headings?

You’ll want to look in your theme files for what you’re doing (wp-content/themes/[name of your theme]). I would highly recommend creating a child theme (Child Themes « WordPress Codex) of your current theme to avoid having the problem come back if there is an update to the theme.