2 Small Code Edits – Help Please

I am trying to change 2 small things with this theme:

1 – I want to remove the featured image from appearing at the top of posts, but was not successful.

I tried by editing the following code from the CSS file:

.featured-media {
display: block;
overflow: hidden;
position: relative;
}

.featured-media a,
.featured-media iframe,
.featured-media object { display: block; }

.featured-media img {
display: block;
width: 100%;
height: auto;
}

What I did was I tried changing the two instances of “display” to “display: none” on both of the above lines of code, but that removed the featured image from the index/home page as well, which is not what I wanted. Does anyone know how I can remove just from posts?

2 – I would like to add post author and post date at the top of posts underneath post title.

Any help would be much appreciated