Final answer:
The checkbox 'Make object accessible' or 'Enable accessibility' in the Flash accessibility panel should be selected to make an object's information available to a screen reader. It's also important to set proper names and descriptions for interactive elements and configure their 'Tab Index' for keyboard navigation.
Step-by-step explanation:
To instruct Flash to pass information from an object to a screen reader, you should enable the Accessibility features available in the software. Specifically, look for a checkbox labeled something along the lines of 'Make object accessible' or 'Enable accessibility' within the accessibility panel of the Flash object's properties. By selecting this checkbox, it signals the Flash player to expose the content of the object to screen reading software, which can then interpret and relay the information to users who are visually impaired.
For interactive elements like buttons or forms, you might also want to ensure that the 'Tab Index' property is set, allowing users to navigate through interactive elements using the keyboard, which is another important aspect of accessibility. Remember that each interactive object should have a succinct and descriptive name and description, as these are the attributes a screen reader will typically announce to the user.