Need real help on this module
As the module page desription says development of this module has been stopped in favour of @font-your-face

@font-your-face is widely used now and has decent documentation, so you should use this one instead of Google font.

Module page description,


  IMPORTANT: I've decided to combine forces with @sreynen, the
  maintainer of the magnificent @font-your-face module. That modules
  does not only support Google Fonts, but also several other font
  providers and combines all those fonts in a very user-friendly
  interface. I will not improve the Google Fonts API module anymore. So
  please switch your site to (the 7.x-2.x version of) @font-your-face in
  favor of Google Fonts. Thanks ;)