Hi there,
You may change your header menu links in X > Launch > Options > Header > LINKS – TEXT
. As for the footer links, please add this CSS to your global custom CSS with your preferred color.
.x-colophon.bottom .x-colophon-content p, .x-colophon a {
color: #fff !important;
}
And this CSS for the sidebar links
.x-main .widget ul li a, .x-main .widget ol li a, .x-sidebar .widget ul li a, .x-sidebar .widget ol li a {
color: #333;
}
But if you’re referring to widgets in the footer sidebar, then you should change it within Essential Grid’s skin builder. Each layer has its own style options that you could change 
Then for social icons, please add this CSS as well
.x-social-global a {
display: inline-block;
text-align: center;
color: #fff;
}
Then to make the uppercase text to normal, please add this as well
.h-entry-cover, .eg-washington-element-3{
text-transform: none;
}
Thanks!