how can i remove about the author from a specific category

you can use either css or you can create a template file and remove the code that’s generating it from your custom template. how comfortable are you with coding?

with css i managed to do it but it ruins the rest appearance

please provide more information:

what theme are you using?
what CSS have you tried and what was the result? (please post a link to your site)

solved?

there is no author info visible in that post;
the used CSS seems to be working:

.category-news .about-author > div {
    display: none;
}

you might need to clear the browser cache to see the result of the changes…