How to setup themes Mega Shop WP

Currently my website is as shown:
I’m not familiar with technology and how to edit themes to make them beautiful, so I hope to receive support in updating themes like the demo like the link:
Pls show for how do it?
Thank so much

You may need to hire someone as this is the part where the “support” ends and it requires “paid work”

Although, you can check the item documentation, there should be some help but I’m not sure if it’d be enough for you.