That’s what I wrote. Lemmy is a software, which can be ran on servers. You’re currently on somebody else’s server. In a group that is moderated by yet different people… They gave some rules to you and you now have to choose whether you’re willing to play by their rules.

Obviously, they haven’t banned you yet, despite you saying lots of unproductive, short sentences. I’m not sure if your original question got answered here. If you’re more interested in the details of how Lemmy works, read (for example) the documentation and Wikipedia article.