Adding Header Image to Mocha Child theme

I have been trying to add my header image to my Mocha Child Theme for hours through my style.css editor. I have been able to do it for previous templates. I have tried playing with the code in different sections after googling for help.

I HAVE TRIED DOING THIS

#header {
	width:950px;
	height: 125px;
	margin: 0 auto 0;
	padding: 0;
background: url(https://mommymiracles.com/wp-content/uploads/2013/01/mommymiracleslogo.jpg) no-repeat top center;
}

AND THIS

<div class="wrapper">
<div class="logo">
<a>"><img src="https://mommymiracles.com/wp-content/uploads/2013/01/mommymiracleslogo.jpg" alt="Mommy Miracles" /></a></div>

AND ADDING THIS AT THE END OF MY STYLE.CSS EDITOR

#branding {
background:transparent url(https://mommymiracles.com/wp-content/uploads/2013/01/mommymiracleslogo.jpg) no-repeat scroll center top;
background-position: bottom;
height:210px;
position:relative;
z-index:10;
}

[Please be sure to mark code with the code buttons or backticks]

BUT NOTHING HAS WORKED!!!!
Help?

I am almost ready to just pick a different theme, but the preview looks like the header image is changeable. I just cannot figure out how, and obviously there is no easy way to just upload the image in “Appearance” or “General” settings. Also, I have all my widgets and ads all in place, and don’t want to start over.

I could really appreciate some help.