theme-settings.php, drupal 6.x, etc

Greetings, and may I say, your theme C01 is excellent in quite a few ways, not least that you have a version available for Drupal 6.x; they're pretty thin on the ground at the moment.
However I do have some questions regarding this theme, Drupal 6.x, and that Theme Setting API doohickey. I downloaded artistsC01-6.x-1.1.tar.gz from the Drupal site, and the themesettings API is not there in a directory; only the theme-settings.php file is present, and it is right in the artistsC01 main dir. I do see some non-standard things in the theme configuration page, and I must suppose they come from that theme-settings.php, although I don't have the themesettings API module installed -- is this a new feature for Drupal 6.x, or something like that? I can't find a great deal of documentation regarding the changes in 6.x, only a lot of advertising hype, generalities, etc, not real specific factual info.
Also, something a little more nitty-gritty; although I have increased the font size at the top of the typography section of styles.css (body { font-size: 98%; } and html > body { font-size: 14px; } -- eyes over the age of 45 ain't what they used to be), I find that I'm unable to increase the size of general paragraph font-size; it stubbornly remains far too small, and though I have perused the styles.css from top to bottom several times, I just can't find where to increase it -- putting a "1.25em" font-size in the regular "p" didn't do anything that I could see; I may soon have to insert a blanket 125% font-size directly in the body statement of page.tpl.php if I can't find it. Can you offer any assistance?
So all you youngbloods out there with excellent near-vision, please have mercy on us middle-aged folks; reading glasses only do so much, and all this squinting is causing way too many wrinkles (and headaches!) -- and do remember, you'll be middle-aged yourself one day -- if you're lucky. :)
Andria
Thanks for the kind words and excuse me for letting you wait.
Theme Settings API got integrated in Drupal 6. So, there is no need to install it. theme-settings.php is just part of the theme that contains all additional configuration items.
Regarding documentation covering specifically Drupal 6 theme, you are right - it is close to non-existent. I'm afraid that we were quite busy in the past couple of months with other projects and as usual - documentation suffers.
As for font sizes, last thing we want is to spoil joy of web-reading for middle-aged people. Not that I don't hope to avoid the trouble myself by using some neuro-interface or whatever available at that time. I admit that the way fonts are done in C01 is not brightest piece of work. I hope that I'll have some spare time to do something about it.
Back to being helpful, base font sizes are set in style.css (line 57 I think):
p, li, label, dl, dt, td, th, a, div.content { font-size:small; }
Just change it any size you like.