that code will not be the same for everybody. most likely, the code someone gives you will not work.
In the Universal Email wizard, go to the body tab and click the DW Edit button. This will open a Dreamweaver template page. Place your cursor in the blue editable region, then go to Insert -> WebAssist -> ecart -> Cart Display Manager. For the display type, make sure to select email friendly, then click OK to apply it.
After the cart display has been applied to the email template page, go to File -> Save, this will bring you back to the universal Email wizard. Click the OK Button to finish applying Universal Email.