Can I add PHP code to each product in Marketpress?

I have "Tag This" plugin installed with a little modification. I am making it where logged in users hit a button and it adds a tag of their username to the post.

I have this working perfectly with posts, but now I need it on each "Product".

Can I add php code to Marketpress to achieve this?

Here is the code I need to be on each product page:

if ( is_user_logged_in() ) { if (function_exists('wp_tagthis')) { wp_tagthis(); }
     else {
} else {
  // display content for guests

Thanks for the help!