I hope you are well today and thank you for your question.
I am not sure exactly what you are trying to achieve here so could you please describe it a bit more in detail by sharing screenshots so that I can better understand it and help you to achieve it?
It seems you are using Blog posts content element on your site to display it so you can customize it using its options as shown in the attached screenshot.
If you want to customize it beyond those options then to achieve this, you have to develop custom code in the child theme of Jevelin theme.
Developing custom code for custom functionality is beyond the scope of support that we provide here. Please see 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