@Keith:
1. You can change the color code in the following css and then add it in “Appearance => Theme Options => Custom CSS” box:
#site-title a:hover, 
#site-title a:focus, 
#site-title a:active {
    color: #ecd78c;
}
2. Just add the following css in “Appearance => Theme Options => Custom CSS” box:
#site-generator .copyright {
    text-align: center;
    width: 100%;
}
3.a. Just add the following css in “Appearance => Theme Options => Custom CSS” box:
#supplementary.one {
    text-align: center;
}
#supplementary.one .widget-area {
    display: inline-block;
    float: none;
    margin: 0 auto;
}
#supplementary.one .widget-area .widget_adventurous_social_widget {
    margin-bottom: 0;
}
3.b. Just add the following css in “Appearance => Theme Options => Custom CSS” box:
ul.social-profile li.facebook a {
    background-position: 0 -43px;
}
ul.social-profile li.google-plus a {
    background-position: -173px -43px;
}
ul.social-profile li.instagram a {
    background-position: -775px -43px;
}