You will need the amazon-key.pem
file that was downloaded in
step 11 of booting up your new instance (see Start an Amazon Web Services computer:).
Then, you can either Log into your instance from a Mac or Linux machine or Log into your instance from a Windows machine.
See: Log into your instance from a Windows machine
Logging in is the starting point for most of the follow-on tutorials. For example, you can now install and run software on your EC2 instance.
Go back to the top page to continue: Starting up an Amazon Web Services machine