Insert a text box (via the button + Component→Text) and place it where you want the copy to be. This is an additional advantage: because you are using a text box, you can place it anywhere, and you are no longer bound by the default position.
Type the text in the text box and decide what text format you want to use. The standard keys of your operating system also work in LessonUp. For example, use keys CTRL+B (Apple: CMD+B) for bold, CTRL+I (Apple: CMD+I) for italic, etc.
Good to know: the grey words "enter your question here", as visible in the image above, will not be visible during the lesson.