You may follow this post to know how to use the 2Captcha plugin to solve Google captcha:
https://www.whitehatbox.com/bbs/BBSPost?fid=17&postid=6762&pid=2#.XsIm3GgzaUn
Just add a Show Variable command to notify you that you need to solve the captcha now, then manually solve the captcha first, then close the notification window, then it will auto start to run the next steps. If you cannot manually solve the captcha when the notification window opens, you can add a Sleep command behind it, and set a enough wait time, then close the window to manually to process.