Theme Horse

Hi Guilherme,
IF you want to display it in front page only then you can do this.
Go to dashboard -> appearance -> theme options -> advanced options -> home page blog category settings
IF you select any category then only the specific category will be displayed in the front page. This effect will be only displayed in the front page only but not in other pages. To have this effect in your front page you need to go to the dashboard -> settings -> reading and select your latest post.
If you want other than this then you need to hire a developer to fix it and customize the code 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

Thank you!