In most cases, running step 5 of the set-up instructions will push all the required colour settings to your Mac.
However, if you still see a message about colour settings not being present after completing this, please follow these extra few steps.
In the Mac Finder Go Menu choose 'Go to Folder' and type or paste in this exact line
With the Profiles folder selected, choose Finder File menu > Get Info.
In the Sharing & Permissions section, click the padlock, entering the Mac admin password if required then assign Read & Write privileges to everyone.
Choose to Apply to enclosed items… as shown
Return to GreenLight and Add GreenLight settings to your Mac then, finally, restart InDesign when prompted.
You will now be able to return to GreenLight and with the correct colour settings in place.