When you compile a PDF from multiple sources, you might find that some of the pages are sideways or inverted when you try to view them on-screen. Never fear! Acrobat can be used to rotate individual pages within a PDF document.
Select Document > Rotate Pages.
Choose your direction from the drop down box (clockwise 90 degrees, counter-clockwise 90 degrees, 180 degrees).
Choose your page range (all, selection, pages) and set any rotation options if appropriate (page of any orientation, portrait page, landscape pages).
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.