If your Jira is hosted on EC2, you can skip Step-1 if you wish to manage permissions through Roles. i.e. Identify your EC2 role and add permissions (i.e. CodeBuildFullAccess, CodePipelineFullAccess & LambdaFullAccess).
On AWS, Create IAM user with permissions i.e. go to Identity & Access Management (IAM) → Users → Click Add User.