Poll from PollDaddy

already a blog user

I participate in blogs on Word Press and on Blogger.  I used Blogger for a poetry course from Provincetown and I used Word Press for a poetry workshop.  We use Word Press at school so I also have a school blog.  What I found a little confusing was trying to sign in with my email.  It kept telling me that already existed.  Can you associate only one blog to your email?