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To edit the AWS Active Directory's Default Security Group that was created by cloudformation, follow these steps:

1. Log in to your AWS Management Console and navigate to the EC2 dashboard.

2. Click on the "Security Groups" link in the left-hand navigation bar.

3. Find the name of the default security group for your Active Directory and select it.

4. Click the "Actions" dropdown menu and select "Edit inbound rules" or "Edit outbound rules" as needed.

5. In the rules editor, add, remove, or modify the desired rules to reflect the access you need for your resources.

6. Save your changes by clicking the "Save rules" button.

7. Repeat the process as needed for inbound and outbound rules.

Note: If you need to make more extensive changes to your default security group or create additional security groups, you can use AWS CloudFormation templates to manage your security groups programmatically.