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.
there is now a better option: use the Structured Data Highlighter on a typical page to graphically show where structured data is, GWT will then assume pages with similar structure have the same elements needing structured data, no need to code anymore.
The option is just below the one that lists you see the Structured Data GWT has/hasn't been able to find.