Go to settings - click on the 3 bars in the upper left. Then go down to settings.
When you search you can save the citations you're interested in. You can create folders for specific topics in your library as well. They'll be added to "My Library."
Click on Export All at the top - you can choose RefMan for Zotero and Mendeley or Endnote for Endnote. It will export the first 20 articles. To export more articles go to the next page, and click on "export all" again.