Hi Micheal
The static colour can be set in your template style settings. For the active colour you can use the following custom CSS..
.hornav ul.menu > li.active > a {
    color: red;
}
For the hover colour you can use..
.hornav ul.menu > li > a:hover, 
.hornav ul.menu > li > span:hover {
    color: blue;
}
Edit to taste.
Ciaran