how to unlock the swift bootloader?

I want to root my swift.

I understand that first I need to unlock the bootloader.

downloaded the android studio in order to have adb and fastboot. ??
downloaded both supersu.zip & cm-13.0-20160316-SNAPSHOT
moved them both to sd card

I start the swift pressing power and volume button up i get the fastboot screen.
I connect to my mac.

nothing happens.

Ive seen an earlier post on xda explaining how to unlock the boot loader by inputing code from the computer to the swift but it looks like my mac does not recognize the phone[swift]
any ideas?
cheers

Have you done the other steps as well? Enabling ADB debugging and OEM unlock from settings?

When you are in fastboot mode, what is the output from:
fastboot devices