Lichess source.

How can I use lichess source code?
How can I use it on another website?

Do you mean how can you view it? or how can you turn it into a website.

How can I turn it into a website?

You need to become a programmer and a sysadmin. Some learn it at school, some learn it by themselves. It only takes a few years.

yup what thibault said... if you already have some programming experience you might be able to just look up a tutorial

Can you send me a tutorial?
I actually do code lol. Never done web.

idk finding answers on the web is just as hard as doing it lol

also, from what I can tell, lichess uses external services, making this a lot harder

Do you know a php chess script?