Here's how to create bookmarks in Acrobat 7:
Open your PDF to the location and zoom level that you wish to bookmark.
Highlight the text on the page, if any, that you would like to use as the bookmark title. If there is no appropriate text, don't worry -- you can simply enter your preferred title at a later stage.
Hold Ctrl-B (Function-B on Mac machines) to create the bookmark. If you did not select text for the bookmark title, you will need to enter it now.
Once you've created several bookmarks, you can click and drag them into a hierarchy (e.g headings and subheadings) or modify the font styles and colors by right-clicking a bookmark and selecting Properties from the context menu.
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.