Install the Google Drive for desktop application on your Mac to sync data to and from your Google Drive with a folder stored locally on your Mac.
Navigate to the Google Drive for desktop download page and click Download for Mac.
When prompted, click Agree and download.
In the Finder, navigate to your Downloads folder, or whatever default location you've set for downloads from your web browser, and double-click on installgoogledrive.dmg.
Drag and drop the Google Drive app to the shortcut to your Applications folder. Note: Once this transfer has completed, you can eject the "Install Google Drive" disk image and delete the "installgoogledrive.dmg" file you downloaded.
Launch the Google Drive app from your Applications folder and authenticate using your NCSSM email address and password.
You will be able to access your Google Drive from the Finder.