Deleting signed document from my free Adobe Sign account?

I have a free Adobe sign account.

I used the account to share a link to a document that I signed using Adobe Sign on my desktop. Now I want to delete the document from the cloud so that the link no longer works and the document is no longer available for anyone to view. How can I do that?

Note: just to be clear, my account is not part of any larger company account and there is no admin or privacy manager attached to the account. It's just a personal free Adobe Sign account. I can't find any documentation about how to delete a document from the cloud for this type of account.