Enable e-commerce tracking in Piwik 3

According to the docs:

To enable Ecommerce analytics reporting, click on Administration > Websites, and select Ecommerce enabled from the dropdown in the Ecommerce column.

Where can I find this “Administration > Websites” menu?

Generally I think Piwik is great and have configured it according to my liking, including several Goals that are all being tracked properly.

The docs also say:

Once Ecommerce is enabled for a website, the Goals menu will be renamed to Ecommerce & Goals and will display Ecommerce reports.

Currently, in my Dashboard I have a Goals menu and an Ecommerce menu (which leads to a page with no data) but not he “Ecommerce & Goals” that’s mentioned in the docs.

Can anyone show me how to enable E-Commerce?