Hi! I hope I'm posting this in the right thread..:P if not please forgive me!

So...I've got a story posted in mugglenet fanfiction, and I'm re-wrtiting it. So far the first chapter is ready to be submitted (yay me! :P) The version posted in mugglenet has three chapters. Should I delete that version and post the new one, or just post the new one and say it's the new version? Or should I just delete chapters two and three of the story already online, and replace the first chapter with the newer, re-written version of it?

Hope that made sense