Which random featured box do you mean, the big one like whats seen in attached image ..... or ones created by similar to that of the listing box plugin.
If its as the attached image i think this will be added within the tpl code, so to put this on your homepage in realty modern template you may need to add the code the home.tpl file.
If you mean the random featured box created similar to that of the listing box plugin that can be changed as stated by others in this thread via the content boxes.
Last edited by Chris Brown; November 26, 2012 at 10:34 PM.