You can customize what is inside the widgets on the page. If a widget is placed on the page you see on the preview, it will be listed on the left side under widgets.
Prefooter 1 column
Footer 1 column
Footer 2 column
Footer 3 column
Footer 4 column
Add all the information you like to add, then click on the Save button.
You can also do the same thing by following How to Edit Widgets instructions in Widgets & Menu > Widgets.