Hi jmbrlw, open the following files:
/wp-content/themes/%current_theme%/wpsc-products_page.php
/wp-content/themes/%current_theme%/wpsc-single_product.php
If this file does not exist then copy the WP e-Commerce Theme files from Settings > Store > Presentation and then re-check the above filepaths.
Place the snippet near line #102 where ‘do_action(‘wpsc_product_addons’,[…])’ is found within wpsc-products_page.php and line #51 of wpsc-single_product.php.
I’ve made a note to add automatic placement support in Custom Fields for a future Plugin update.
