I had such a hard time making the buttons for my journal I thought I'd pass the knowledge along so no one else has to suffer through that!
Just download the pdf, and copy the relevant code to the right places, following the notes.
Warning: Images not provided. If you want to make your own most sites provide their logo in a large format that's easy to use as a base for custom icons. There are many free icon sets floating around the web too, easy to find.
Confused? Lost? Let me know if my instructions aren't clear or if you have any questions!