Can't upload/connect to MKR1000 on Mac

Hi. Have been through all of the help files - and FAQs and videos... but don't seem to be able to connect to my new MKR1000 board that came with my MKR IOT Bundle.

Am on Mac.
Have tried downloading the Arduino SAMD boards driver.
Have tried resetting.

When I plug it in, I only see bluetooth listed. And when I upload a sketch, I get an error every time. Am newbie to Arduino... and just can't seem to get my first one up and running with a simple blink program.