how to configure link colors css

You can configure link colors with the "a" tag, try injecting the following CSS code: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

a {

    color: green !important;

}

a:visited {

    color: purple !important;

}

You may visit this page to learn more about CSS and link: http://www.w3schools.com/css/css_link.asp 

Let us know if you need more help.