You have to use the "Active URL references" feature.
The paper published before is to be available in the Internet.
First you need to add the exact URL of the published paper to the body of your document. Pay attention: not the "notes" in the doc/x documents, as only the main text is extracted.
Second, start the program and follow the wizard up to the last screen.
Enable Detect "URL" references option.
Check your document.
If everything is done right - all the text, available at the link present in the document, will be considered "referenced" and marked blue.
I hope it helps.