What does "swapping" my job mean, and how do I do it?

At any point in the billing month, an active job can be swapped-out for a new job, without additional payment.

To do this, simply go to your job overview, and select "Settings" on the toolbar near the top of the page.  On the following page, you'll see a section labeled "Swapping," (pictured below) where you can swap your current job posting out for a new one!