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First you can just copy those files to your template folder.
For example: if you are using beez_20 template, then your css file will be saved here: www.yoursite.com/templates/beez_20/css/com_koparent/koparent.css
If you do not want to use online editor but you want to edit those files manually, you can just copy those files to your template folder.
Joomla 2.5 released with a host of new features. Some of these new features were major improvements including multi-database support, smoother upgrades and new search engine. Other improvements were smaller but still very useful. For example, using the new Language Override Manager you can now easily change any of the default text on your Joomla site.
There is an excellent article written by Peter Martin which we are always referencing when our subscribers are creating a multilanguage site.
The standard output from any Joomla! Module or Component can be overridden by adding code to the
html directory of your template.