Success!
After some more digging, I found this:
.post-meta {
font-size: 0.9rem;
margin-bottom: 7px;
}
And then added this to it:
/*
* Added to remove the "Published by" line.
*/
.post-meta span.author {
display: none;
}
.post-meta span.date {
display: none;
}
/*
* End of modification.
*/
@torres126, thank you.