Katin1,
If you download the html files to your computer and COPY them to a safe location, you can edit the files and if they don't work, you can use the saved files to restore to the original online content.
Another thing you can do is edit the file with the HTML editor, save it, upload it, and check it. If you don't like what you see, use the HTML editor undo feature to get back to the original.
The font colors are easy to edit. You will find something like #FF0000 for red, #00FF00 for green, and #0000FF for blue. #000000 is white, and #FFFFFF is black. That means you can make very fine adjustments in the color to get exactly what you want.
Here is a link to a site that will give you lots of information about styling your web site
http://www.w3schools.com/css/css_colors.asp
Let us know if you run into any problems.