Change Email Address

somehow my email address got changed to my school email.  The problem is that I cannot accept any new businesses because the school blocked me from being able to do this.  When I forward it to my home email, it won't accept it because it doesn't recognize it.  I remember I originally set it up through my home email and somehow it mysteriously changed, as did my email address on facebook.... another mystery.  How do I get it to accept my home email address at  @yahoo.com?