Goto your HOME directory
Unzip the given 'ssh.zip'

// If Linux/Mac Machine perform this
chmod 600 .ssh/config
chmod 600 .ssh/codecommit_rsa

Now lets test to verify it works by running this command in 'Git Bash'.

ssh git-codecommit.us-east-1.amazonaws.com

You have successfully authenticated over SSH. You can use Git to interact with AWS CodeCommit. Interactive shells are not supported.Connection to git-codecommit.us-east-1.amazonaws.com closed by remote host.