Can I modify a job posting if no one has applied for the shift?

Yes. You can edit your job's rates, start time, and end time if you need to fill the shift but don't have any applicants. Doing so will send a new notification to local candidates with the required qualifications. 

To edit your job posting: Log in using the Web Portal. Go to Open Jobs, click on the appropriate job, and click on Edit Job in the job details window. Now you can modify the hourly rate, start time, and end time to attract more candidates. Please note that the Edit Job option is only available for jobs without candidates.