Each section represents a footer column and not using a column will expand the other columns. The content field for a section will display in its respective column.
Content > Link Lists > Social Links
The monklet "Social Media Monklet" is used in "footer column 3" and displays icon links from a link list. Each link will need a URL and and Icon Class. The custom icons are created by entering a custom class in the "icon class" field (ie: icon-twitter).
A full list of custom icons is available here: https://mk047.monkpreview.com/_assets/fonts/icons/icomoon/
The monklet "Newsletter Sign Up" is used in "footer column 3" and displays an email sign up form, which will add subscribers to the "Newsletter" group (People > Groups).
If this monklet is deleted from the footer column 3 section, then this sign up field will be removed from the footer.