Click "Menu" > "Word processing" > "puppyPDF convert file to PDF".
I'm not certain this utility is in all versions of Puppy.
If you have a Puppy with OpenOffice.org or Scribus, these will both export to PDF too.
For puppy version 2.16 and 2.17 a pdf printer is included. for 2.16 you must set the pdf printer as you default printer. For version 2.17 you can print to the CUPS-PDF printer. See the following thread for more details. http://www.murga-linux.com/puppy/viewtopic.php?t=16910