Please see: https://desk.zoho.com/portal/timmyinc/kb/articles/how-to-make-myself-available-to-work to view instructions on how to make yourself available for work on your preferred time.
Please see: https://desk.zoho.com/portal/timmyinc/kb/articles/how-to-edit-delete-my-availability-for-work for a detailed instruction on how to edit/delete your availability for work.