You can either use the javascript mode to insert the cancellation link, or you add the code - which is visible at the module configuration - into your template.
Both features does allow you to modify the output of the hint box.
With the Javascript Mode you do not need to edit your template. The share cart link will appear automatically!
Javascript Mode
Edit the file
template.php. The file can be found in the module directory.Manual Mode
You can copy & paste the template code from the text box at the module configuration and insert it in the file /templates/ordercart/$yourtemplate/viewcart.tpl. Modify the code as you want.