To Delete an Annotation
In the graphics area or the 
View Content pane of the upper data panel, right-click the annotation and select 
Delete. The annotation is deleted.
View Content pane of the upper data panel, right-click the annotation and select Delete. The annotation is deleted. | Alternatively, in the Annotations context tab that appears in the ribbon area, in the General group, from the Delete list, select Delete Selected Annotations. |