Hi There,
If you want to hide the “Published on, by” which is in the entry-meta, then you can use the following css for it;
.single-post span.posted-on {
display: none;
}
.single-post span.byline:nth-child(2), span.author.vcard {
display: none !important;
}
NOTE: Please use the child theme style.css or custom css plugin to write the css.
Thanks