About Creating Annotation Features
You can create Annotation features at any time by clicking Annotate > Annotation Feature. When you create Annotation Elements, you can either select existing annotation, or create annotation on the fly. As you select the Annotation Element type, the system invokes the regular user interface for creating this specific annotation type (a note, a symbol, and so on). Once the annotation is successfully created, you can specify parameters or select additional references for the Annotation Element.