all the footer stuff can be found in the footer.tpl file.
How you edit it depends on your level of web development experience and on how far you want to take your customizations.
If you plan to make a lot of changes, the best way is to use standard web development techniques and edit the files of the skin via SFTP. Make your changes on the files in your skin.
If you just want to tweak a few things, then you can do that from within the ACP via the TEMPLATES tab of the skin.
There are benefits to both methods.
The purple tint for that skin is not one that is made available to the ACP, so you'll need to adjust the css file.
look for it around line 444 of:
/skins/YOUR SKIN/css/skin.css
It will look like this:
.index .overlay, .dark .overlay, .footer .overlay {
background: rgba(120, 20, 60, 0.8) none repeat scroll 0 0;
display: block;
height: 100%;
left: 0;
position: absolute;
top: 0;
width: 100%;
z-index: 0;
}
Change the rgba() to the color you want. The way I would look to find the color I wanted for this is using the very common web development tool
* Firebug
in the firefox browser, along with the
* Firepicker
extension. This will allow you to choose the color you're after exactly, then you add it to the css file and upload.
Clear the caches for the system at:
ACP -> MODULES -> CORE -> TOOLS -> RESET CACHES
and see how your changes look.
repeat.