This is a Theme API tag that is usually added to the shopping cart template file. When custom templates are setup in your theme the file is located somewheres around wp-content/themes/yourtheme/shopp/cart.php
. Note that yourtheme
represents the directory name of your active WordPress theme files.
Shopp has starter templates built in that you can copy to your theme files. Editing the template files in the Shopp plugin is not recommended because you will lose your changes with each upgrade.
You can copy the files from Shopp to your theme yourself, or you can use the built-in system for copying them. More information about these templates and how to install them into your theme for customization can be found in the Shopp User Guide documentation in the Theme Templates article.