Ahhh. Sorry! In that case, all I know to tell you is to edit your articles individually. While the editor is convenient, I usually write my content in a text editor using XHTML markups. That way, I can use custom styles which I can then change later via CSS, if needed.
For example, when you use the editor's underline button to underline a segment of text, the editor puts span tags around it like this:
<span style="text-decoration: underline;">This is my text.</span>
It would be much better to mark it up yourself like this:
<span class="underlinedText">This is my text.</span>
Then, you would have this in your CSS file:
This way, you can modify how all of your underlinedText appears site-wide. I'll bet that there is a way that you can get styles like that to show up in your editor's Styles and Format drop-downs, but since I always just do the markup myself, I don't know exactly how to do this (assuming that it is possible in the first place).
If I get a few extra minutes, I'll play around with this and post what I find.