Get FTP access to Wordpress deployed in Google Compute Engine

I need help with Wordpress and Google Developers Console. So we can now deploy Wordpress from Google Developers Console, bypassing having to use Google App Engine, like a 1 click install. It's easy to SSH into it, but not understanding SSH very well, I would like to gain FTP access so that I can change some things in wp_config and themes. This is the job: to find out what my FTP log in details are to my wordpress deployment in Google Developers Console. I use Cyberduck as preferred FTP .