Users can send a signature request for 'received' purchase orders. Follow the below steps to send a signature request. 

1. Click on Purchases > Purchase Orders
2. Open any received purchase orders
3. Click on the more option
4. Click on 'Signature Request'

5. Clicking on the Signature Request will open a popup that sends an email to the vendor/client to request a signature.

6. Add the email address of the recipient in the email address bar. 
7. Click on the send icon to request a signature on the received purchase order.