1. Do you mean single product page?
In this case you need select sidebar layout in Theme Options > Single Product Page and add any widget (even empty Text widget) into “Single product page Sidebar” area in Appearance > Widgets.
2. I’ve added Static Block widget to “Footer 2” area in Appearance > Widgets.
Please check footer now.
3. As I see your single product page is shown correctly. Please show on a screenshot what you want to edit.
4. Original sizes should be 870px × 1 100px approximately.