All new postings from new employers go through a brief review process, to ensure they are legitimate, and do not contain errors. Once your posting moves to the Pending folder, you do not need to take any further action unless instructed. Your posting will be processed, and then moved to Active when processing is complete. If any problems are found with your job posting, you will be contacted by email and alerted to the problems, as well as given instructions on how to fix any issues.
Turnaround time for pending postings can vary depending on how many postings are waiting for processing, but generally takes 1-2 hours.