Have you installed a free or premium WordPress theme ? And you would like to (have someone) make changes to it ?
A WordPress child theme is a theme that inherits the functionality of another theme, called the parent theme.
Using a child theme allows you to modify or add functionalities to that parent theme.
A child theme is the safest and easiest way to modify an existing theme, whether you want to make a few tiny changes or extensive changes. Instead of modifying the theme files directly, you can create a child theme and override within. You can read more about this in WordPress’ codex.
I can make any desired changes to your existing template.