Do you have a link to your site? There are a couple versions of Epik available, so I want to make sure I give you the exact line to change in the css.
Or, you could just add this to your css file –
.epik-darkblue .entry-content a {
color: #000;
}
That should target the links inside of the content area. You can change the #000 to whatever color you prefer. Let me know if you need assistance picking a color.