Go to the Scheduler Menu: You will find a dropdown at the top right side of the screen, select Audit.

You will find the list of unscheduled Audit at the right side under Unscheduled Audit(s).

Now select the Audit from the list, simply drag the Audit from the list to the Calendar date at which you want to get that Audit done.

As soon as you drop the Audit to the selected date, you will get a success alert popup.

Success alert means your unscheduled Audit is now scheduled.