Promoted Links - add rows

Hi,

I really need to be able to split out my promoted links by rows.

I found this blog/guide buy I'm a newbie and don't understand how to add a 'jquery' or what that even means.

Here's the link maybe someone here can explain how I do this:

http://jsypeksharepoint.blogspot.com/2012/09/adding-rows-to-sharepoint-2013s.html?showComment=1376323645797#c4133710449505539678

qeqw