Job posts are free with an active WNW subscription.
The number of jobs you can post at the same time depends on the type of plan you have.
With a Basic plan, you get 1 active job post at a time. A Pro plan includes up to 3 active job posts at a time.
You can swap out job posts as frequently as you want. All of your jobs are stored under "My Jobs".
Please note, closing a job post is not the same as cancelling your subscription.