If the pop-ups doesn't work, it's handy to scan the articles again. This is done by clicking on 're-scan all articles' which can be found under settings. You must use this button if you have created a new article with product links or if you have modified an article.
Click Re-scan to rescan all articles
Alternatively, if you would like to scan a new article or an article that you have updated, in the article under "More actions", click "Scan Product Links".
Click "Scan Product Links" to quickly scan an article