At the end of the regular season, each coach who has not signed up for another season will receive an email reminder. After the conference championship, coaches who still have not signed up for another season will receive a final reminder. At the end of the season, any schools whose coaches have not signed up for the subsequent season will have their teams made available to the general public.
Once you lose your school, you can not automatically reclaim that school and will have to go through the job hiring process.