You can edit everything about your job before hiring a freelancer. After you hire a freelancer, job post edit is not possible.
To edit your job:
1. Click the Jobs tab.
2. Locate the job you want in your Open Jobs and click Edit Posting in the Actions menu.
To cancel or close your job:
1. Click the Jobs tab and locate the job you want to close in your Open Jobs.
2. Click Remove Posting in the Actions menu and follow the instructions. You can always come back and repost the job or hire a freelancer. When you remove a job, the submitted proposal will be removed too.