If you have previously linked a candidate to a job vacancy, but no longer require them to be linked to a particular job, you can remove them from it. 

To do this, open the candidates tab and click on the green cog for the candidate you wish to link up with a job vacancy and select jobs.

Any job vacancies that the candidate has been linked to will be shown on the new window that appears. To remove them, click on the x next to the job title.

Click save when done.