How can I have my client add me as a reviewer?

Your client can add you as a reviewer by using the step-by-step instructions in How do I add a reviewer to a document set?.

Once you’ve been added as a reviewer, signature requests cannot be sent out until you and all other reviewers confirm the information entered. Document set participants won't be able to sign documents or do anything besides enter information and provide signature blocks until all reviewers confirm the most recent information.

If any document set participant changes any information, all reviewers must confirm again. If a new reviewer is added, the parties will not be able to sign documents or release signatures until the new reviewer has confirmed the information in the document set.