Click the Callout tool at Comment > Annotate to add comments as callouts. Then click on the page to open a callout text box and enter text.
A callout is a text box with an arrow.
If necessary, the box expands to accept longer texts. 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.
Select the Hand tool as soon as you have all the callouts you need.
To change text properties of a previously created callout, select it with the Hand tool at the top of the Panel bar or the Callout tool in the Annotate group and double-click to have access to its content. Make a text selection and right click, then choose Properties to access the following toolbar:
Click Set to specify current settings as default, or specify default values for text boxes and callouts by selecting File > Options > Comment.
To set text properties quickly, without using this toolbar, right-click on the selected section in the text box, then click on Text Style in the shortcut menu, and select any format (Bold, Italic, Underline, Superscript, Subscript) to apply.
TIp: See the shortcut menu under Text Style for standard keyboard shortcuts for quick text formatting.
To move or resize a callout, use the Select tool or the Hand tool at the top of the Panel bar. You can move the object as a whole, the text box only or the arrow.
To change the appearance of the callout, right-click and choose Properties to specify style, thickness and color for the box border and arrow, a fill color and opacity value for the text box, and a style of the arrowhead. You can also access the Author and Subject, and History properties. To avoid accidental modification, choose the Protected checkbox. For more details on object properties, see Annotation and Markup Object Properties.