I’m still trying to figure this stuff out myself man. I just went onto the community and the link in the URL bar is https://lemmy.ml/c/oldweb
Not sure if that works for you?
Ok, I’m able to paste this link on the search box of the instance I’m on and then I can subscribe to this community.
I’ve seen some communities mentioned in the form of !oldweb@lemmy.ml but it probably depends of the client if it gets parsed as a clickable link?
I have much to learn. 😁