Sorry to tell you but it would need to develop custom code.
Developing custom code for custom functionality is beyond the scope of support that we provide here. See here https://themeforest.net/item/jevelin-multipurpose-premium-responsive-wordpress-theme/14728833/support
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. shufflehound recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5