[Plugin: wp Time Machine] Beginner's Set Up

I there. I installed wp Time Machine, version: 1.9.16
I see where it says email, password, and directory. Forgive me, but those are for what? I have an S3 account. Do I put the s3 login info there? The dropbox info there? How does it know which one I’m trying to connect it to?

http://ww.wp.xz.cn/extend/plugins/wp-time-machine/