Click the Create PDF task button and choose From File from the options. The Open dialog box opens.
Certain file types can be converted to PDF documents directly from within Acrobat. In order to use the Create PDF From File command, a file has to be saved in a file format compatible with the Convert to PDF From File options.
Choose All Files (*.*) from the Files of Type (Windows) or Show (Macintosh) pull-down menu. Click cb_cover.tif. Click Open. Click the Fit Page tool.
The TIFF formatted file opens as a new PDF in the Document pane.
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.