1 - Head to Admin>Glossary and choose Contacts and Users from the dropdown menu.
 
2 - Choose the Job Request Originator option from the left-hand list and on the right-hand list open the single option shown. 

3 - Navigate to the user you require, open their record, and choose the Approvals tab. 

4 - Choose Add and double click on the Works Order Contact option then save the record.