Second Logo HESTIA

Hello, I’ve tried adding a second logo using this code provided in the Hestia documentation:

.navbar-not-transparent .navbar-brand img {
content: url(“url-here”);
}

But it’s not working. I added it to the theme’s style.css file. I don’t know how to create a child theme nor have I ever used FTP (Filezilla) so I can’t follow the original instructions at all.

Can someone help me? I would prefer to simply add the required code to the original files without creating a child theme.

Thank you,