Download Google Drive to your Mac
Open Google Drive in your Chrome browser and Click the Settings Icon. Choose Download Drive.
Click Agree and Download.
Click the Download Drive button and choose Mac and PC.
Google Drive will have downloaded and you should be able to see it in the bottom left corner of your Chrome browser.
A window will open that has the Google Drive icon and the Applications folder icon. Click on the Google Drive icon and drag it into the Applications folder icon. You will see a dialog box open.
Final Steps - Adding Drive to Finder & Toolbar
Sign in to your Google Account.
You will do this AFTER clicking NEXT several times.
Google Drive now shows up in your toolbar and...
in your Finder window.