1. You should go to Theme Settings, and make sure that 'Display Widget Dummy Sidebars' is set to False/No (please look in the instructions which came with the theme,)
2. Then you should go into the Widget page (Appearance > Widgets) in the backend of the theme, and remove the widgets you don't want from the footer widget areas, leaving only the map widget , or map + 1 more if your wish.
3. You should also look in the settings for the Google Maps plugin, to change the size of the display since it seems to be hard set right now at 300x300 pixels.
If you cant find the controls for the map widget ( i never used that one thus I am guessing ) its best to contact support for the widget ( http://wordpress.org/extend/plugins/mappress-google-maps-for-wordpress/ ) to get the proper directions as to a way to correctly re-size it.