For Self Hosting customers (AMIMOTO AMI user)
First, Start up your favourite terminal client software, e.g. Terminal.app or iTerm for macOS, Teraterm for Windows.
Second, run the following commend.
$ ssh -i ~/.ssh/PATH-TO-YOUR-KEY-FILE/YOUR-KEY.pem ec2-user@IP-ADDRESS-OF-YOUR-INSTANCE
Example: in case the key file is example.pem and your instance's IP Address is 127.0.0.1
$ ssh -i ~/.ssh/example.pem firstname.lastname@example.org