Hi caldopollo. Good to see you on this friendly Forum.
May I humbly offer some advice here. First choose your favorite template. Then familiarize yourself with all the modules, especially Pages, Navigation, Forms, and Developer. You will see that there are literally thousands of options built in.
Each template has a special place for custom modifications. If you do not utilize this method, you may later regret it. UNA is not built like your average forum or social software.
I was too eager to make changes myself - later I was squirting tears. I made the changes in the wrong places, you see. They worked great until it was time to upgrade...
Learn from my mistakes, all who will.