PDF (adobe.com)

Enter text

Use the Text tool  and the options in the Property inspector to enter, format, and edit text in your graphics.

Note: If the Property inspector is minimized, click the expander arrow in the lower-right corner to see all text properties.

Text objects are automatically saved under a name that matches the text you've typed. You can change the assigned name in the Text box of the Property inspector or in the object panel thumbnail in the Layers panel.