What happens to the .pem file for AWS EC2 Instances managed by Koding?

I am currently using Koding to launch an AWS EC2 Instance and use it for my development.

I supplied the access credentials through IAM (Key and secret code) and that was all I had to supply for launching an instance using the script provided in the Koding.

However, I’m now at the stage where I need to coect my instance through PuTTY on my Windows machine and it requires me to supply my .pem file but I never received it in the first place!

How do I go about acquiring .pem file associated for my already launched instance??