Hi there,
Firstly I see you have a WordPress.com site, so for future questions you can take advantage of the in-house support provided here, no need to post in the .org forums:
https://wordpress.com/help/contact
Taking a look at demo site for your theme, I see it has 4 footer “columns” as shown here: P7BJtq-1I-p2
The theme was not designed to display a single full-width widget in this way, so it would require a lot of custom CSS code to pull that off. Essentially it would be necessary to “un-code” the default behaviour of the footer. You could try this as a starting point:
.footer-widgets-wrapper {
max-width: 100%;
}
However, if I can make a recommendation I would consider displaying that table in the page itself (add it to the page editor view for “whereabouts”) instead of trying to display it in the footer. Trying to add full-width content in this area is something that the theme is going to fight against, even when using CSS to override.
Hope that helps!