Now you have aws cli installed, you'll have to configure it access your AWS resources. You can have multiple profiles like test, dev, prod, etc profiles. So let's assume you want to configure it for your test environment.
aws configure --profile=test
It will ask for following information:
AWS Access Key ID [None]: XXXXXXXXXXXXXX AWS Secret Access Key [None]: XXXXXXXXXXXXXXXXXXXX Default region name [None]: us-west-2 Default output format [None]: json
You will get the above information from IAM management in AWS Console.