You can use the Cloud Manager AMI from the AWS Marketplace to launch an EC2 instance in a standard AWS region (a region other than the AWS GovCloud (US) region). This gives you access to the Cloud Manager software, which is automatically installed on the instance.
AWS uses the key pair to secure the instance's login information.
Amazon Web Services (AWS) Documentation: Amazon EC2 Key Pairs
Amazon Web Services (AWS) Documentation: IP Addressing in Your VPC
Otherwise, you must use the Manual Launch option to assign a public IP address to the instance.
Log in to Cloud Manager by using a web browser and complete the Setup wizard.