Open powershell and type aws configure
aws configure
enter access key
enter secret key
enter region
enter output format
To create multiple profiles like dev/qa/staging follow down below.
aws configure --profile your_profile_name
enter access key
enter secret key
enter region
enter output format
List all profiles on your local computer.
aws configure list-profiles
If you want to set one of them default
set AWS_DEFAULT_PROFILE=profile_name
You can also edit aws files on your local computer. Please follow this link.
https://stackoverflow.com/questions/593334/how-to-use-multiple-aws-accounts-from-the-command-line