Sign up for the first rotation by Sunday September 17.
Groups will be announced the following Sunday (September 24).
There will be signups again in January for a February-May rotation.
If you decide you want to stay in after the first rotation for another one, you don't need to do a thing; you will be kept in the member pool automatically.
Decided that you need a break or this is not for you? No problem. Just let the office know and you'll be removed from the pool until you say otherwise.