Page Level Ads on Customizr Theme

Trying to add Adsense page level ads to customizr, but when I click on Appearance the old “editor” choice is gone. It now says “edit css” but no longer offers the “Templates” bar on the right to select a page to add the snippet.
Anyone have insight into how to add page level ads to customizr?
My site:
https://supportgroupsgalore.com/
Bobby Stanton