You need to sign up for at least 6 hours in total for the year (two 3-hour shifts). If you have more than one player you need to sign up for 9 hours (three 3-hour shifts).
If these times do not work for you, opportunities will be available after the end of the season for the boys state tournament, March 14-15.
You can do one shift at each tourney if you like, but you need to do at least one shift at the girls tourney.
More details are availalble here: https://www.ergyb.org/news_article/show/1069094