Go to configuration (top menu bar)

Go to Custom –> Extraction

Choose XPath from the drop down menu

Then to scrape og:image URLs add the code:

//meta[starts-with(@property, 'og:image')]/@content

 

 

To see your results go to:
“Custom” tab

Then scroll right to see “Extractor 1” and “Extractor 2”

If the column is empty, it should mean that there is nothing declared for that og specification