To carry out the steps below to activate this functionality for your test:
Click on the appropriate properties icon (depicted as three interacting cogs) for the relevant section/item. The Section level properties icon can be found on the right of each section. The Item level properties icon can be found on the right of each item.
The properties will appear in the Properties Panel on the right.
Open the drop-down menu Test-taker Tools and check the Text to Speech box at the bottom.
The text-to-speech functionality is now enabled, and will be available to test-takers for the relevant sections or items of your test.