This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.

Create page with wt_cart plugin

Create a new page called “Cart” or “Order” or whatever you want and add a new content element. In order to add the wt_cart plugin choose as type “Insert plugin”. On the tab “Plugin” select as plugin “wt_cart : cart”. That's it. No additional settings are available. Nice ;)

On the same page add after the wt_cart plugin a new powermail plugin and configure it. Create all the required fields and logic you need.