Uploading Child Theme CSS

I created a “child” directory in wp-content/themes/iconic-one and uploaded my css file to it in my FTP. I cannot find how to upload it to my site. Appearance > Customize > CSS option does not show up for me. I put this at the head of my file:

/*
Theme Name: Iconic One Child
Theme URI: http://themonic.com/iconic-one/
Description: Child Theme for Iconic One
Author: Rebecca Sarver
Author URI: https://www.facebook.com/rebecca.sarver.31
Template: iconic-one
Version: 0.1
*/

@import url("../iconic-one/style.css");

My site is http://www.cs634g1t1.qwkdog.com