How would one aquire the font from the theme like Hipster for example. ~ 'Dancing Script'
It's not available from Coffeecup Font Store? And if I find it online, would I need additional software, like Website Font 4.1 to make it work with Web Form Builder?

If you download the font to c:windows/fonts you then have it on your computer. Then you'd have to edit (I counted) four areas in the source code as seen in my image. I did a word search for Oswald font and it came up with these areas where it's been used. It will be overwritten when updating your form though.

Edit: by the way, I'm a newbie, so this is up for suggestions