What DNS record do I need to set up for the custom domain?

One CNAME record does it. Point your chosen subdomain at Snaptide's white-label host: NAME/HOST = the subdomain you picked (like "albums"), VALUE/TARGET = white-label.snaptide.ai. So for albums.yourstudio.com, you create a CNAME with host "albums" pointing to white-label.snaptide.ai. If you've ever pointed a domain at a website builder or a mail server, it's the same five-minute job. DNS changes can take a little while to propagate, so don't panic if verification doesn't land instantly.