If you run the Vantage theme on WordPress, you’ll notice the “A SiteOrigin Theme” footer. If you want to get rid of it, remove it, delete it, here is how to do it.

First, create a child theme. In your newly created styles.css, add the following lines:

#colophon #theme-attribution {
display: none;
}

Reload your website in your browser (Type F5) and voilà, the “A SiteOrigin Theme” footer should be gone.

Interested in WordPress site networks (multisite)?

Have a look at the following posts if you are interested in setting up a new WordPress site / site network or backing up multisite installations:
Create and set up a new WordPress site (within a site network)
The best free and multisite-compatible WordPress backup plugins