What needs to be done for students who currently are approved for Screenreader who want to use the new embedded tool?

Nothing needs to be done. College Board will add the accommodation of Text to Speech (Embedded) for all students who Students who currently are approved for Screenreader (Text to Speech) for Digital Tests.  Students will have both Text to Speech (Embedded) and Screen Reader (Non-Embedded) and may use the accommodation that is most appropriate for them.