Hello and welcome to the forum!
I’m not particularly well versed in EZ Publish (actually, I have literally no knowledge of it, sorry!), so I’m just guessing here.
There should always be a template available somewhere. Regardless of how user-friendly/easy it is, there has to be a place for somebody to be able to change the design/layout. That place will be where your templates are.
Your first step is finding those files!
(Btw, I deleted your post in the PHP section, you only need one)