Go to Appearance -> Customize in the WordPress admin dashboard. Or go to themes, and customize your active theme. This takes you to the theme customization view. Here you should see customization options for the footer, and it will usually (depending on the theme) show you configuration options for mobile/desktop.
Go to Appearance -> Customize in the WordPress admin dashboard. Or go to themes, and customize your active theme. This takes you to the theme customization view. Here you should see customization options for the footer, and it will usually (depending on the theme) show you configuration options for mobile/desktop.