Choose the references you need using Add to Folder icon on far right side of reference entry (video needs to be updated, icon was below reference)
Go to Folder at the top right of the page
Select All and click Export
Leave "Save citations to a file formatted for: Direct Export in RIS format..."
You won't see the option Endnote vs. Endnote web (video needs to be updated).
The first time you will get an option to "Open with" or "Save" (not included on video).
Choose EndNote program
Also select "Do this automatically..." so you don't see the prompt everytime.
All the references should automatically be added to the EndNote Library
If the references still aren't added and/or you are being prompted to find the EndNote program or library file repeatedly, check your Firefox Preferences then Applications. Search for "ris" and make sure it is set to "Use EndNote X7".