All together, my QuicKeys now works on my MacBook Air. Next, I redownloaded QuicKeys from Startly and THEN I went to gb2's directions. I didn't see it, but after I quit and restarted QuicKeys, it worked! However,I had first dragged the QuicKeys app to the trash, emptied it, then restarted.

Thank you for your reply! I did everything that Startly recommended (actually, gb2), and when I dragged the QuicKeys Helper into the Privacy box.