How do i log in to Prezi when Facebook is blocked ( i have a facebook user).

Hi,

I have a facebook user (Achi Solomon), and usually I log in to Prezi with Facebook, and everything works fine : ) 

In some places the Facebook is blocked ( for example my new work place), and there is no chance they will unblock it… 

But i still want to use Prezi in order to make a powerful impact ( love Prezi hate PowerPoint) .

So - How do i log in to Prezi when Facebook is blocked? can i have regular user also?

thanks,
Achi Solomon