I have uploaded the Goudy Bookletter 1911 font into your converter and inserted it into a web page. How do I reference that font in my css?

doesn't work.

Go in to the font javascript and scroll to be bottom, you should see a bit called "full_font_name". Use the name that they give and reference it in CSS either like...
font-family: "name of font"; or font-family: name of font; (without quotes), whichever works