How to remove/change sellers name ?

I guess that could be achieved via setting CSS display to none on the relevant element. Share your site URL so someone can help you out.

here is the link to store—> https://www.shopzepp.com

Add this to your child theme’s style.css file, or if you theme has a setting to add custom CSS, you can use that too.

.single-product .product_meta{ visibility: hidden; }
.single-product .product_meta .sku_wrapper,
.single-product .product_meta .posted_in { visibility: visible; }

.variation-Soldby { display: none; }