Hi.i m having ipad3 ios6..can anyone teach me how to highlight on iBook PDF?how to read PDF without highlighting..?so sad...I jus bought it..on the way learning how to use it..

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PDF files in iBooks can not be annotated. Bookmarking a page is pretty much all you can do.

There are quite a few PDF reader/annotation apps available for the iPad that will probably suite you better in this regard. I like PDF Expert for this kind of thing. There are many other PDF apps devoted/specialized for different types of users.

If you are more specific about how/why you want to read and use PDFs' someone is bound to know the ideal app.