If a document is in process, you can choose to remind all signers who have not yet signed the document in question, or only one signer of your choice. Please note that a signer can only be reminded once per 24 hours.
Remind all signers of a document:
You can remind all outstanding signers of a document by navigating to your Documents list, finding the document in question, and clicking the righthand "Send Reminder" button.
Remind single signer of a document: You can remind an individual signer of a document by opening your document and clicking "Send Reminder" next to the signer's name.