Hi @Adán !
I can’t check if you already have one Docusign Demonstration Account, only Docusign Customer Support will be able to check it.
However, you can create a Free Demonstration Account by accessing https://developers.docusign.com/, then Developer Account Dropdown (orange button on the top right) > Create Account. After that, everytime you’d like to access this demo environment, you can access https://demo.docusign.net.
Please, let me know if I was able to help you with this question. If so, could you please click on the "Select as Best" option? Thank you!
"Select as Best" below if you find my answer is a valid solution to your issue and mark it as resolved.