In order to use tooling to access VinylDNS, all users must download their credentials from the VinylDNS portal. The credentials are located in the User Menu in the top right corner of the site after login.
If your credentials are compromised you can generate new ones. In the User Menu select Regenerate Credentials. Regenerating your credentials will invalidate your previous credentials. If you are using any VinylDNS tools beyond the portal you can then select Download Credentials to retrieve your new credentials and update the tools you use.