You can't do that directly in Joomla (except if you don't have some special component for browsing and editing server files).
For customizing modules, see module folders. For example, if you want to customize Top rated albums module, you need to edit top_rated_albums.css or(and) default.php (located in modules\\mod_muscol_top_rated_albums\\tmpl folder).
MC styles are defined in css files located in components\\com_muscol\\assets.
But if you want to change positions for example you must edit component view files located in components\\com_muscol\\views\\>typeofview

So...where do I go to find the module folders?

Or do I have to download a component first in order to me to get access to these kind of folders since I'm presuming they are hidden, correct? I'm still not understanding what I'm suppposed to do.

Thanks for the help, I appreciate it.

Modules is a sub-folder of your web site root folder. It is not hidden, so you can access to this folder over FTP connection or using some other FTP tools provided by your host.

Alright, bear with me here since I'm learning this for the first time:

So I have to sign into my host account, go the FTP setup they have (or download CuteFTP or another FTP manager) and once I log in via FTP, the module folders will be listed there? And once in the folder, the files will be there and I edit them there via an editor?

Does the site have to be live in order for me to do this because currently...it isn't. It's actually down for maintenance so does this mean I can't do the changes if it's not up?

hello!

WHICH modules exactly you want to change the colors to?
usually it's very simple: you just have to open and edit the CSS file related to the module. for instance, the CSS for the module STATISTICS is located in:

/modules/mod_muscol_statistics/tmpl/statistics.css

that being said, the best way to "know" what CSS properties are responsible of each color/size etc.. I use the plugin FIREBBUG for FIREFOX, a great tool to find css styles!

Yes, I figured it out as someone suggested Firebug to me and it was a great help.

Thanks for the help.