On the Editor toolbar, click the white box, then type out your text.  Hit enter for a new line (shift + return on some keyboards).

By default, the text is center aligned.  You can left or right align the text using CSS. Simply copy the URL to this CSS file.  Click Configure in the project.  Paste the URL into the Custom CSS URL field.

This will set the default alignment to left.  To set a specific annotation to right or center alignment, on the annotation, click Edit, More, Add Class. Then type text-right or text-center.

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