Widgets
Newsletter widget
If you don't need it, you can deactivate plugin Newsletter in Admin -> Plugins.
To change title & description for this section or remove it from footer section, you can change it in Admin -> Appearance -> Widgets
To translate other texts of this section, go to Admin -> Translations -> Theme translations.
Site information
Go to Admin -> Appearance -> Widgets.
You can click on "Delete" button to remove widget from footer sidebar or change content for this widget.
If you want to add more widgets, just drag and drop from the left side to sidebar.
Footer menu widgets
Go to Admin -> Appearance -> Menus (modify menu Company, For Jobs, For Candidates, Support)
You can change or remove those menus from footer in Admin -> Appearance -> Widgets.
Blog sidebar widgets
Go to Admin -> Appearance -> Widgets.