You can use it on as many devices as you want, as long as they have the same IP address. The service will not work if you log in from 2 separate IPs, and you could get banned for that. As long as someone isn’t streaming from your home IP, you can log in while visiting your parents to watch. Basically just make sure if you use multiple devices they are on the same Internet connection.

If you go to the help section and search for “IP” you can get more info!

Image for people who don’t want to log in.

Select the theme you want then toggle “match system light/dark theme” on and off again.