Hi Hussain,
We are sorry to say that it’s not a simple work that you are thinking about.
Moreover, the customization service does not include item support. Please learn more about the Envato Market (Codecanyon) item support policy (item support includes & not includes), here https://codecanyon.net/page/item_support_policy
Based on the Envato Market (Codecanyon) item support policy, we are only available to assist you with the item included feature, not for customization to add a new feature.
However, as we said, “we have listed this in our plugin feature update list. We will try to add the radio select option in our future update of the plugin.”
If you are in a hurry based on your needs then you could contact here https://www.themelooks.com/contact/ to get a quote for the customization service.
Best Regards,
ThemeLooks Support Team