Mario wants to make his document accessible to assistive technology users. He first needs to access the Accessibility Checker. He can do this by clicking the tab. Next, he needs to click the option. Then, he needs to click the icon. When he clicks on the Check Accessibility option, the Accessibility pane will open. He then needs to read the information about errors, warnings, tips, and steps he needs to take to make his document accessible to assistive technology users.