Note: the default time zone for the closing date is UTC. You can change this to match your time zone by pressing 'UTC' below the date modal.
From the sidebar on the left, click on a job opening under 'Your jobs' or head to the 'Jobs' page to navigate to the job.
Click on the job you want to set a closing date for.
Click on the gear icon in the top right corner to navigate to the job settings.
Click 'General' at the left-hand sidebar and scroll down to 'Closing date'.
Select your time zone and the date + time you want the job to be closed. That's it! Your job will be closed for applications on the date and time you set.
Candidates with the URL can access the job opening even when it's closed, but they won't be able to apply as the 'Apply now' button changes to 'Applications closed'.