Hello @sermir,
Thank you for using free version.but the option you are looking for is not present on the free theme, but what you can do is you can add this option by creating a child theme.
to build a child theme for the parent theme,
(https://codex.wordpress.org/Child_Themes )
Or you could upgrade to the pro-version which has this option. To check the pro-version please check http://themepalace.com/downloads/expedition-pro/
Best regards