You can subscribe to any community with an account on another instance.
Think about it sort of like email, you can send a messages across hosts not just on your own, like sending a message from a @gmail.com email to a @outlook.com email.
If you go to the communities page on your home server you should be able to find communities on your home server (will look like “community name”) and not (looks like “community name@server.name”), at least if make sure you show all not just local communities.
You can subscribe to any community with an account on another instance.
Think about it sort of like email, you can send a messages across hosts not just on your own, like sending a message from a @gmail.com email to a @outlook.com email.
If you go to the communities page on your home server you should be able to find communities on your home server (will look like “community name”) and not (looks like “community name@server.name”), at least if make sure you show all not just local communities.