you’re on kbin, you can tell because your username ends in @kbin.social, which is a kbin instance. Instance is just another name for a server. Due to federation you can view and comment on threads from any other federated instance. You can also join maganzines (called communities on Lemmy, groups on mastadon, and subreddits on reddit) from any other federated instance as well. The only thing I don’t think you can do is become a moderator on another instance. Note, the content is being brought to your kbin feed because we are federated, if you go to to the original instance you’ve left the website and thus won’t be logged in.