Recipients greyed out in draft agreement

Hi - I created an Adobe Sign document. Once I had completed the recipients, I went to the next page to capture the fields where people must sign. I then realised that I had left someone out, and so saved the document as a draft. If I select the document from the agreements page and select edit, I cannot add a recipient as the fields are greyed out, which means that I would have to delete the agreement and start from scratch, which is highly annoying. How do I add a recipient to a draft document?