By adding an order of signing you can determine that the SignRequest will only be sent to one signer after another signer has signed.
For example, you only want your customer to receive the SignRequest after a colleague has signed the document. In that case, you can set your colleague to '0' and your customer to '1'.
Follow these steps:
1. Add a document and your signers the usual way
2. Click on the "Advanced" button
3. Define the order by adding a number behind each signer
4. Now continue with the usual steps
You can set the order to as many signers as needed. A user that is defined as "Copy only" can remain '0' as this user will only receive a copy after all signers have signed the document.