Help modifying sidebar to dynamic

Hi there

I’m trying to do a quick site to help my friend for his music.

The theme I’m using doesn’t use a dynamic sidebar. I need one to use the widget feature….

This is the theme…. can anyone tell me which code to replace? I’m thinking it’s a matter of tweaking the functions.php as well as sidebar.php

https://www.freethemelayouts.com/showcase/creativeart-theme/

Many thanks in advance