Users of FD10 / 9 / 8 can save any report or text document as a PDF by going to File > Save As PDF.
FD7 for Windows: Only script files can be saved as PDF files. Text files and reports cannot. However, you can save reports or text documents as RTF files, which can be read by any standard word processor.
FD7 for Mac: Go to File > Print and in the standard print dialogue box, at the lower left, is the option to print to PDF.