
1. URL for background image: This is where you uploaded your image to. So if I uploaded my background to www.my-photoshop.com, my background URL would be http://www.my-photoshop.com/bg.png - you do need to use the http://.
2. Tiled Image / Non-Scrolling Image: If you are using a big background that you don't want to "move" or "expand" when your box gets bigger, then you would use the Non-Scrolling Image box. This is the box that you use when you don't want your page background to scroll, for example. For the type of background we're using, though, we want the little image to fill in the whole background. So, tick "Tiled Image".
3. Background Color: Because we want the background to be semi-transparent, we can't have any background color already in the section. We want the page background to show through. So, click the "Set to Transparent" link and the box below will fill in automatically.
4. CSS: This box will fill in for you as you make changes to the above settings. You really don't need to worry about it at all.
5. Apply Setting to all Panels: If you tick this box, you won't have to go through every single panel on your page and make changes to the background. Of course, if you want to use different backgrounds on different sections, don't click this box.
6. Example Text: As you make changes to the settings, this whole area will change. It shows you exactly how your panel background will look - right now, mine shows that it will let the page background show through, and that my text is black. Perfect!
7. Save / Cancel: When all your settings are done, you must click Save or the settings won't be changed. If you did something silly and aren't sure what you did, you can click Cancel and everything will go back to the way it was before you messed with anything.