WordPress Multisite Lightsail Bitnami apps directory missing, manual edit wp-config

I am trying to follow https://youtu.be/J5thWR_C_0c but no apps directory in /opt/bitnami$ so I'm stuck at 2 minutes 30 seconds, help please? What I need to do next is get the main WordPress using the external domain name as currently it does this: http://18.169.236.30.nip.io/wp-signup.php?new=west-cheshire.co.uk instead of showing the blog home under http://www.west-cheshire.co.uk/ I think I need to manually edit wp-config