@metaright@kbin.social Account migration isn't possible yet. But you can sign up to as many instances as you like with the same username and email. Also you can post to any KBin or Lemmy instance as long as it's federated with your home instance.
However sometimes there's issues, like right now with me not being able to reply to you directly.
You can use a different one. Only one will be your main. My beehaw username is slightly different to my others. I never use my beehaw, but it's a great backup.