Hi Waris, you are welcome at I&B community. You have come to right place to get support for this theme, now coming to your question :
Answer : 1 :
Find following in index.css of Rusy white,
body {
background: none repeat scroll 0 0 #AFAFAF;
font: 78%/130% "Verdana","Arial","Helvetica",sans-serif;
margin: 0 auto;
padding: 15px 0;
}
Replace with :
body {
background: none repeat scroll 0 0 #PROVIDE YOUR COLOR HERE;
font: 78%/130% "Verdana","Arial","Helvetica",sans-serif;
margin: 0 auto;
padding: 15px 0;
}
Replace PROVIDE YOUR COLOR HERE with your won color, say black then should be #000000
But Rusty white was designed to work even with older browsers and for changing background color you need to edit images too. For that :
Find images in Themes/rusty-white/images/theme/
like
blockn.png and change its background to color you want.
There are few more images you may need to fix.
2. To change logo, login to Admin , goto :
Admin--> Configuration --> Current theme -->