PDF Annotations, Highlights and Markups
You can view, create, edit and delete various kinds of PDF notes, drawings, highlights and markups.
All annotations that you create or edit in GoodReader - notes, highlights, markups, and drawings - are saved in a PDF file, so you will be able to see them later on a computer or in another copy of GoodReader on your colleague's device.
Two main gestures that you should use to work with annotations - quick single tap, and tap & hold. Depending on where you tap (on a text, on an existing annotation, or on a free space on a page), different popup menus will be presented to you.
iPad only: In addition to the popup menus, you can use the Side Menu that appears when the navigation menu is on. There's the "pin" button on that menu. Use it to force this menu to be always on-screen for some heavy annotating job, then close it when you're done.
To edit or delete an existing annotation, tap it briefly, or tap and hold it for a while. Two special cases to note: text note popups and highlights/markups. When you tap a text note, a default action (opening a note) is invoked right away. To access more options (deletion, color adjustment, etc.), tap and hold it for a while. On the contrary, when you tap and hold a highlight/markup, you activate a default action - text selection, which is more natural for an underlying text. To access special options for a highlight (deletion, color adjustment, etc.), you have to tap it briefly.
Just memorize the following very simple rule: one of two gestures (quick tap or tap & hold) should always work. If one of them doesn't, try another.
Besides self-explanatory text buttons, there are graphical buttons on the annotations menu:
就是使劲按住你那个标亮几行,自然就看见可以删除的东西了
http://www.goodiware.com/gr-man-view-pdf.html#annots