From today's date onwards, you can report availability that shows when you can or cannot work. Select the desired date and click on "Add availability". If there are any availability templates they are shown at the top of the list. Choose the one that suits you or press "Custom availability". If you select the latter, you will get a new page where you can enter your own availability. Finish by checking "Available" or "Not Available". Then press "Save". Your availability appears in your monthly schedule as a colored circle, green with a tick for available and red with a cross for busy.