Thanks for the suggestion. I had been looking at the control panel to find the color/font customizations, and found nothing, of course.
If the CSS is defined in a lot of places, though, it will be beyond my skill level to do all the fixes that are required. Also, if I upgrade, would I lose the customizations??
I tried using Visual Styles Modules by JoomlaExtensionsStore to fix the colors and text, but the tool could not change the colors and text.
Looks like I will have to pay a designer to make Ad Agency Pro look like the rest of my site. That makes adding the Ad Agency functionality much more expensive, maybe not worth it. :-(
Please consider adding some color/text customizations to your product. Not many Joomla users will be happy with the default red and orange colors, since it is likely that those colors do not match other colors on a typical modern website. In the U. S., red indicates "no" or "warning" and is typically not used for "buy now" buttons.
Moving forward, I hope that the Joomla community starts focusing on making extensions that can be easily customized by non-coders and those coders who don't specialize in template design. That way, Joomla can catch up with WP in popularity. :-)