Add a font for text and another font for H1 etc

Hi I wonder how you can add a font for the text for all text writtenm in this case Georgia size 12 and then another one for H1 for example font Impact and also set the size correctly there,

And also how this works for EasySocial if you would like to do the same there with same font structure ie Georgia for text and Impact for headings..

Thks,