Summary:
If your client has (1) filled out the form to sign the contract, but has perhaps filled it out incorrectly by putting in the wrong email, or (2) if they've generated a contract but then noticed an issue with it and they want the issue corrected before they sign the contract, you'll have to first delete the existing
Instructions:
From the within the affected event go to the "Docs" tab
You will see a contract with the status "not signed"
click the trashcan icon next to this document and then confirm you want to delete it
Once the draft contract has been deleted, the "sign" button on the proposal will reactivate and your client will be able to redo the signing process