You can add as many signers as required in your documents. There's no limit. When setting up the envelope you must specify each signer's name and email address, the order in which you want them to sign, and tag the document specifically where each individual needs to sign, initial, date, it full in other information. 

See this page on how to Start an Envelope. 

Michael

Can I edit/add signers to a document I already sent?  Or do I have to start over?

If the document is still “In Progress”, you may correct the envelope to edit/add the recipients.

If an envelope is not yet completed, you can Correct an Envelope to change any signer who has not yet signed or add additional signers. If at least one person has already signed, you can not modify or replace the documents but you can add more documents to the envelope.

Basically you can't change anything that has already happened but you can change what has yet to happen.

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