Please don't say "Mastodon" when you mean "ActivityPub" or "the Fediverse". This is like your elderly parents calling their computer "The Facebook" or "The Google".
Why is this step necessary? mastodon.bida.im might not be the server where you are registered, so we need to redirect you to your home server first. Don't have an account? You can sign up here
mastodon.bida.im