I accidentally put someone else as "me", how do I change it without getting rid of my entire family tree?

Answer 1

I can thin of two methods.

1. Download the tree then reupload it, selecting your self when prompted.
   This method will show you as the founder, but you'll loose the edit history.
    
2. Goto yourself, create an invite link, coppy the link, select My Account (top right corner), remove the tree, past the link to open the tree, then select Add to Account (top right corner between Save and My Account)
   This method will not show you as the founder, but you'll be able to keep edit history.