Can I change the expiration date on a document sent for signature?

How do I change the expiration date of a document sent to 11 people for signature? 10 have already signed.

@Linda Penasso, as Manager​ Locate the envelope under your Sent folder, select correct in the dropdown to the right of that envelope. Go to Advanced Options near the email message at the bottom of the first screen, update the Expiration and complete all the steps required to finish correcting the envelope.

Thanks!

as a sender, to change the expiration date drop down is blocked out so I cannot change it. how can do it?