The way to do that properly would be to create a child theme and edit all the PHP templates.
But I believe there is a simper workaround using CSS.
In Main Options > Menus > Info bar > Info Bar Location, select “Above Content Area”
Then add the rules below in Advanced Options > HEad Section > Custom CSS Rule Box
#container_wrap {position:relative;padding-bottom:70px;} /*sets the container as reference and create space at the bottom for the info bar*/
#infobar {position:absolute;bottom:0px;} /*set the info bar to be positioned absolute so it can be moved over and at the bottom*/
#infobar {position:absolute;bottom:0px;} /*set the info bar to be positioned absolute so it can be moved over and at the bottom*/