Step one reads: After signing up on their website, find the Dashboard and copy the "Product Browser Widget Code." This snippet will be what pulls up your products on the HTML page.
That could be more specific. I took me ten minutes to find the Product Browser Widget Code. Maybe screenshots and better directions? Something is needed.
It looks like Ecwid updated their interface. We've updated our documentation to reflect the changes: http://nationbuilder.com/adding_ecwid_shopping_cart_nationbuilder. Thanks for pointing that out for us!
Thanks Tim! Chances are we haven't looked at that in a while. I'll let our writing team know!