First I think you’ll need to go back to the Header uploader in WP and then change the color to default so it doesn’t have a priority and override the other code.
Then look in your css file and change this code (on line 3063)-
.epik-gray #header a {
color: #fff;
}
That is for your title.
For your description (right under it) change this code (on line 669)
#description {
color: #eee;
line-height: 1.25;
padding: 10px 0;
}