When you reach the "sign-off" section of the form you can begin typing the person's name.
Users' names in the system will be shown and may be selected.
If the person is not in the system, tap the blank signature field (beside the "Sign" icon) - this will bring up the "Select People" page.
Enter the person's name, click the circle
When the circle is tapped, the name will populate - in grey - in the signature field as shown, below:
Tap "Sign" and the person will then be able to the dynamic signature field to append their signature - note: the dynamic signature field auto-rotates the mobile device to allow more room for signatures.
Be sure to tap the blue"Done" button to add the signature to the form.
The app will rotate automatically back to vertical plane allowing the form to be completed, Saved, or Submitted.