If you have a subscription plan, go to the dashboard, and in the right menu of each job, you will be able to choose between Pinning and Boosting the job.
If your job is featured (pinned), you can still give it Boost to give it extra visibility, sending up to 200 invitations to professionals that match the profile.
Note that confidential jobs cannot be featured because they do not appear in public views, but you can always give them Boost, and send invitations to professionals.