The answer depends on how you promoted the Pipeline. On Free job boards or did you pay for a sponsored campaign?
If the pipeline is only promoted on Free job boards
You can change the job title by following these steps:
1. Click on the Job Details tab in the Pipeline
2. Scroll down and click Edit
4. Change the Job Title field and click Save to confirm the change.
If the pipeline is being Sponsored (paid promotion)
When your Pipeline is being sponsored, the process is the same but it may take 24 hours to see the title change on external job boards.