Rex,
You seem to be dealing with a rather strange site structure. The text you quoted as being the one you want to edit appears identically in three different pages, which are also different files. Take a look at these pages:
http://www.rwchapman.com/
http://www.rwchapman.com/index.asp
http://www.rwchapman.com/products/index.asp
Those three pages (files) have identical text, but differ with respect to the header image, which suggests that they are different files. For all I know there may be more than these three that have that same, identical text.
If you modify the text in one of those files, you obviously would need to update the other ones as well.
It makes no sense to me that the home page is identical to the 'Products' page, with the only exception being the header image.
The site does not seem to be very large and should be fairly easy and quick to re-do from scratch. Now might be the time to do just that - and eliminate the duplications in the process!
Just noticed Inger's post(s). Good advice! The presence of 'Includes' would certainly explain some of the strange duplication with only the header image being different.