Removing "a siteorigin theme" from the footer using a child theme

Hey, i am pretty new to wordpress today when i updated my theme it naturally removed my customm settings that i edited in the theme editor.

Now i’ve created a child them to prevent this, however now i need a css code in order to remove the footer text saying “a SiteOrigin theme”. I managed to remove it earlier by simply removing the line from the css file in the editor, however now i cant because my editor looks like this:

[ Moderator note: code fixed. Please wrap code in the backtick character or use the code button. ]

/*
Theme Name: Vantage Child
Author: SiteOrigin
Author URI: https://siteorigin.com/
Theme URI: https://siteorigin.com/theme/vantage
Description: Vantage Child Theme
Version: 1.0.0
Template: vantage
Text Domain: vantage
Domain Path: /languages/
*/

/* =Theme customization starts here
-------------------------------------------------------------- */

rather than the long css file it used to show before creating a child theme….

Can anyone help me with the code so that i can remove this from my wordpress site??? ??