Editing specific areas of Abantecart

[Ollie]

How do I go about editing these areas of the Confirmation page?

<div id="payment"><?php echo $payment; ?></div>      
<?php echo $this->getHookVar('payment_post'); ?>

I want to change the CVV2 image to pop up on the same page instead of directing to another page. I'd like to go to the specific area of Abantecart to make this change instead of replacing the above with hard code.