RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.youtube.com/channel/UCQptOqc1X312QL__6AVRRtQ?sub_confirmation=1$1 [R,L]
Redirect 301 / https://www.youtube.com/channel/UCQptOqc1X312QL__6AVRRtQ?sub_confirmation=1