How to create new $var

I am using the “Simple Shopping Cart” plugin. The way you call a shopping cart is:
<?php echo print_wp_cart_button_for_product(Title,ProductPrice); ?>

I have like 300 products, and the price and title are stored as either “The Title” or in a custom field for the product. Does anyone have any idea how to store the call for the custom field in a variable and then input it into that Shopping cart function above.

This post seems to give an answer: https://www.tipsandtricks-hq.com/forum/topic/coding-question-for-simple-cart-wp-plugin-with-custom-field-template-plugin

But I don’t understand where to add the following code:

$prodname = <?php echo c2c_get_custom('MMTname'); ?>
$prodprice = <?php echo c2c_get_custom('MMTprice'); ?>

in order to change things to this:

<?php echo print_wp_cart_button_for_product($prodname, $prodprice); ?>

Thanks!