Before proceeding, here are 3 important details you must know:
By default, Rotas and Workforce Management assumes that you're always available to work. The availability feature allows you to indicate only your preferences (green) and unavailability (red).
Your availability can either be recurring or punctual. You just have to make sure to select the right frequency.
If you aren't available on a specific date, submitting a punctual time off request is much easier than changing your availability. To learn how to submit a time off request, refer to this article.