Add an eWitness to your document using the Party dropdown on the xEdit page.
To add a witness, first add a signature field for the primary signer, then:
Use the dropdown menu to select that Party's corresponding witness (e.g. for Party 1, select Party 1 – Witness)
Drag and drop a signature field for them
Enter their details on the Send page, or click decide later to let the Signer decide.
Just like adding a Party, users can add an eWitness to their document on the xEdit page using the drop-down menu just below Signer Fields.