Prezi is saying my email address is not registered on a different computer?

Hi,

I have tried logging on on a different computer and it is saying that my email address is not registered with an account. I also never recieved any welcome email. I have nearly finished working on a Prezi for university and don't want to have to start again.

Thanks

My email address is zoe.rackham@gmail.com


Also, as this forum is about issues logging in, having to log in to create a post is a bit ridiculous!!!!