Question

[MikiHeart]

I see your confusion now. I just looked in the files and there seems to be a few style sheets in there.

In the header.tpl file, it calls on 'style-city.css'

You could try editing the values in there to see if it works. I don't have the script installed at the moment, so I can't test right now.

Open 'templates/main/media/style-city.css'

Find:

body {
background:#222;
font-family:Verdana, Arial, Tahoma, sans-serif;
font-size:12px;
color:#333;
}

Change

background:#222;

to

background:green;

Save, exit.

Go to 'templates/cache' and delete all the files in there.

Go to your browser, and refresh the page. If the background comes up green, you've found it! Then just change it to whatever colour you want.

(this is my lame method of changing colours in default templates XD)

Edit:

The code for the header image is here:

#image {
border-left:10px solid #fff;
border-right:10px solid #fff;
border-bottom:5px solid #fff;
background:url("citylights.jpg") left no-repeat #91C7F5;
height:150px;
}

You just have to change

background:url("citylights.jpg") left no-repeat #91C7F5;

to

background:url("yourimage.jpg") left no-repeat #91C7F5;

Make sure the image is uploaded to 'templates/main/media'

The image has to be 150pixels heigh, not sure about width. I'll get back to you.

Edit again:

I'm guessing no larger than 650pixels. Maybe a bit smaller, because that's the size of the wrapper.