This depends on what software you are using. It is an option in your PDF converter
before you create your PDF file. Once your PDF file is created, there is no way to
embed the fonts in your document in Adobe Acrobat prior to version 9. If you are using
Adobe Acrobat to convert your document to a PDF file, search the help for "embedding
fonts" to find instructions for your version of Acrobat.
The Graduate School has instructions on how to check if your fonts are embedded and how to embed fonts using MS Word. ProQuest provides resources on preparing manuscripts for submission, which includes information on embedding fonts.