To specify that one of your jobs is a remote, work from home, or telecommute opportunity, check the box next to 'List this job as Remote' while editing your job. 

Remote job

When you list a job as Remote, it will be posted as a nationwide opportunity on job boards that support remote positions. Note: If your account uses locations, the location you select will be only used for internal purposes. The job will be posted publicly as a nationwide opportunity.

Make sure to click Save Job when you're finished.