I used Weebly to build my website. My site is 'on' Google, but GWT is saying it can't detect any structured data.
Where and how do I do this? I understand what it is but don't know how to go about doing it.
This article from Google describes it well. In short:
For example, if you have a product on your site you need to wrap some custom HTML around it. Look at the example at the bottom of the product page, or for an even simpler example:
All the divs and spans are the extra stuff added to make it structured.