(using the Transmit.)

스크린샷 2013-07-12 오전 12.03.00

Server : Public DNS of EC2 instance

User Name : real username ( can see SSH Client name : here is ubuntu & not your aws login ID)

스크린샷 2013-07-12 오전 12.04.02

Next, Click the KEY icon, and choose the your <key>.pem

스크린샷 2013-07-12 오전 12.03.28

Connect, and easily edit the sources opened with various editors.

스크린샷 2013-07-12 오전 12.11.26