Hello,
Please also check our documentation regarding footer set up: https://www.8theme.com/demo/docs/legenda/index.html#!/footer
Those pictures are added as banners. You can do this in admin panel > Pages > Home page, and add row with custom layout 1/2+1/2 under Revolution slider section, add Banner element from Visual Composer. There you’ll be able to upload your image and add some text.
Regards,
Eva Kemp.