To create a callout:
Select the Callout command from the Insert menu. The mouse pointer will change to a +.
Move the mouse pointer over the position you want the callout to point to, click, and drag the mouse to the position where you want the callout text to appear. Alternatively, click anywhere over the document to insert a default callout.
You are now ready to enter the callout text.
You can change the position, size and appearance of a callout.
See: