Separate names with a comma.
I think I'm running into this same issue where I'm hitting up against an activation limit! Can you help?
I published a guide on how to get this set up here: http://ranvel.com/macos Let me know (through here) if you have any questions.
In the keyboard settings, you can also make your keyboard use the F* keys, instead of the function keys (like launchpad and mission control), but...
