I had a friend "publisher" help with organizing and publishing my children's book through a self publishing company. We have no written contract. He was to help me for gratis as he learned the process of publishing a children's book. During the process he registered the copyright for my book with his name as the author and my name as a Pseudonym. 

What does this mean for me and my book and how do I fix it?

It was my concept, my text, my idea concepts for the illustrations, my money.  He basically negotiated and sent my book through the process of printing.