When you added the AWS EC2 cloud to a RightScale account, user-defined credentials were automatically generated for you with the provided AWS credentials. Although you can select and use those credentials just like other user-defined credentials when you define inputs in the Dashboard, they will not be visible or editable under the typical location for user-defined credentials. (Design > Credentials)
There may be several reasons why you may find it necessary to change your AWS credentials at a later time.
Unfortunately, you cannot change the AWS Account Number once you've created a RightScale account.
However, you can change your AWS Access Key ID, Secret Access Key and x509 certificates from the dashboard (Settings > Account Settings > Clouds). You must have 'admin' privileges to change cloud credentials. There will be a pencil icon beside the Actions column on the cloud name in any of the AWS Regions, clicking on the icon will popup a window where you can change the above information. (Note: If your main motivation is to change the credit card information, you can change it by logging into your AWS Account (http://aws.amazon.com).
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