On the Annotation ribbon, choose 
Select Annotation.
On the page, click the annotation.
Once selected, you can perform any of the following with annotations:
To work with an annotation in Image View or ImageViewer, you must first select it on the page.
On the Annotation ribbon, choose Select Annotation.
On the page, click the annotation.
Once selected, you can perform any of the following with annotations:
To move an annotation, use the mouse to drag the annotation to the new location.
To resize an annotation, place the pointer on the handle you want to drag. Use the mouse to drag the resize pointer and change the annotation size. You cannot resize text lines or scribble annotations.
To edit annotation text, double-click the annotation that contains the text you want to edit. The text cursor appears at the beginning of the text line. When you finish editing, click elsewhere on the page or select another annotation tool.
To delete an annotation, click the right mouse button, and on the shortcut menu, click Delete or select an annotation and press the Delete key.
Tips
To select multiple annotations, hold down the Ctrl key as you click each annotation.
On the Edit ribbon, choose 
Select
All in the Annotation Tools group to
select all annotations on a page.
On the Edit ribbon, the 
Cut and 
Paste commands are useful
when you need to move an annotation to a different item or to a different
page in a multi-page item.
To change properties of a current annotation, right-click the annotation and use the shortcut menu. To change the default properties for future annotations, choose the annotation type you want, and then choose a proper attribute in the Annotation Settings group and specify a value for it. Changing default properties does not affect existing annotations.
You can hide annotations and then display them when necessary. This feature is useful when you want to see the entire original image or page without annotations.
On the View ribbon, the Annotations checkbox in the View Options group toggles this feature on and off.
Tip
Click on the PaperPort button and choose 
Print Setup. To prevent
annotations from being printed, clear the Include
Annotations checkbox in the Printer
options dialog box.
PDF Viewer Plus has its own annotation tools for marking up PDF files. See the PDF Viewer Plus Help.