changing a font color

I have been trying all day to find out how to change the font color of the
"log yourself" that is in the line "Welcome Guest! Would you like to log yourself in?"
I have been able to change the font color to black for the page and I would like to
change the log yourself to some other color so the user will notice that it is click-able.
My site is http://w w w . s i e r r a s w e e t s . c o m /horse_cookie_store/
I have looked at every .css file I can find and I just don't see where it is.
k1

Do you mean the hover over green or the grey?

The green is in templates/brighton_pets/css/stylesheet.css line 9:

a:hover, #navEZPagesTOC ul li a:hover, #navMain ul li a:hover, #navSupp ul li a:hover, #navCatTabs ul li a:hover {color: #8ec63d;}

If you want to just change this link and no others, you can update your CSS to edit the .greeting h2 class to use something like the below.

e.g.

.greeting a:link, .greeting a:visited, .greeting a:hover, .greeting a:active {color: #COLOURYOUWANT;}

Hope this helps.