In order to add a Live Twitter stream, please go to your Library and edit a lesson. There, select Add Slide.
From the three options in the pop-up, select Add Content. Select the arrow in the right to look at more options.
Choose Live Twitter stream.
Please add the Twitter username in the box. You will be able to test it. Then, select Save.
The slide will be added to your lesson as the last slide. Please select Save & Exit.
Now you're ready to continue editing or launch the lesson.