For editing or removing Back to Top or Quick Contact items go to Theme Options > Footer > More
Instead Quick Contact also you can create any page and assign it.
For changing Copyright text go to Theme Options > Footer > Bottom of Footer > Icon and Text Element
For changing Background color of row, go to Theme Options > Footer > Bottom of Footer > Container Style Kit
This is a Title and Text Element, By mouse hover over it you can edit it and under Shape tab you can change or remove Yellow Shape.