[Theme Horse Support Team]

Hi nt.izuchi.617,
Sorry we don’t have this feature in our theme. It needs code customisation but We recommended not to change the code because if you change the code then while updating to our new version all your customisation code will be lost. So better make child theme and first unhook the functions and the edit the code.

http://codex.wordpress.org/Child_Themes

If you are unable to change the code then you need to hire a developer to fix the issue.

Thank you!