Each district assigns contact people to enter job openings directly on the site. Each district is in complete control of what information gets posted, when and for how long.
All categories work the same way and require nearly the same information.
The number of current openings for this particular job. Contact between you and potential applicants is completely at your discretion. You may even decide to have applicants go through your Regional Office of Education. If you choose, applicants may e-mail you a text copy of their resume.