On the right hand side of the page, you will see the 'Hiring Team' section. You will begin typing a user's name to add them to the team for the job.
The additional team members will be able to see the job and complete tasks. They will also receive notification emails whenever a candidate applies and/or completes a SmartRank survey.
You can only add registered users to the hiring team (If you need help adding a user to your account, look here).