I am editing ColorMag free theme on Wordpress for my own blog.For the slider in the homepage TG: Featured Category Slider for the free version I want a help how to made it with arrows/controls (previous and next) and also with indicators (in the bottom of the sliders) showing them responsive in mobile and desktop view. As there any way to customize or add some line of codes without any plugin for creating static or dynamic slider. I want to customize the default slider the colormag has and how to made all the changes I wrote.

Can you help with any code? And in which part of Customize--> Theme Editor, folder should I add it, these code?