Google Captcha Harvester
To setup your Google harvester, click on the captcha button from your dashboard. You will be presented with the captcha floating window.
From this window, you have two options. The refresh icon one will refresh the captcha and request a new one. The window icon will open a browser where you can log into your Gmail account.

Note: To increase your chances of receiving one click captchas, it is recommend you browse the internet at least 30 minutes before a drop.