To add a Text Annotation to the document, please click on the Annotations icon on the top toolbar, select the Text Annotation option from the dropdown menu and draw the annotation on the page by clicking and holding down the left mouse button while moving the cursor.
By clicking once on the placed annotation on the document, the Text Annotation Properties window appears where one can enter the text for the text annotation, specify the font size, set the text to be left, center or right aligned, select a font face and set the color of the text.
Please click on the Close button to finish editing.