If you are familiar with the liquid template customisations then you can use any third party JS slider library to integrate the slider on the page.
It needs you to place some HTML and JS code to make the slider working.
Have a look on this library:
Let me know if any help is needed.
You can find it on your theme, because this request seems already on the theme.
If your theme does not support this feature. You need to know about snippets/codes to integrate into your theme.