Primary font-family

[Rixa]

Hey,

How can I change the font size of the primary forum.
How will it be implemented? I now have so

Primary Font Family "Source Sans Pro", Helvetica, Arial, sans-serif

I would like font (body), for example. 'Lato',Helvetica,Arial,sans-serif

 

[Paul B]

Style Properties -> General -> Body -> Font Family

 

[Rixa]

Thank you!