Click the Text Box tool in the Comment Toolbar to make visible comments. Drag a window and enter text. The text box expands to accept longer text. When entering a text, make a selection, right-click in the box and choose Properties... from the shortcut menu to modify text properties for the selection in the toolbar shown below. To change text properties of a previously created text box, select it with the Hand tool or the 
Select Object tool in the Standard Toolbar and double-click to have access to its content and the text toolbar.
Click Set to specify current settings as default, or specify default values for text boxes by selecting Edit > Preferences > Comment.
To move or resize a text box, use the Select Object tool in the Standard Toolbar or the Hand tool. To change its appearance, right-click and choose Properties to specify border style, thickness and color, a fill color, and an opacity value for the text box. You can also access the text box Author, Subject and History properties. To avoid accidental modification, choose the Protected checkbox.
Text added with this tool remains as an annotation. To add new text to the real content of a PDF page, use the Typewriter tool or the Typewriter Box tool. To modify existing text, use the Touchup Text tool.
Click the 
Callout tool in the Comment Toolbar instead of the Text Box tool, to add an arrow headed line pointing from the text box to a place on the page.
