Hey Theweblady,
the body font can be set in the “Typography” tab of the Theme Options panel; the body text size is not changeable via the admin settings, as it is a part of the theme’s visual, yet you can alter it by adding a custom line of CSS at the very end of the “style.css” file (opens by default when you visit the “Appearance -> Settings” admin section):
body { font-size: 16px !important; }
Sincerely,
Andrii / Satori Studio