This will vary by the school or organisation. The printed menu will display the available days, or you can check online.
To check online, log in to your mykindo account. You will see the service and the first few available days. Click Show More Dates to view a longer list.
Once you have selected your first date from this list, the menu will be displayed that is available for that day. You can choose to add any of the meal items for just that day, or for several days at once.