Change password (forgot my password) when having a new e-mailadres

My e-mail has changed and I forgot my password.. When I login with facebook and want to change my e-mail, prezi is sending an email to my old adress (not existing anymore) so I can't change it...

Old e-mail: g.w.bakker@wanadoo.nl

e.g. I registered this forum on my new e-mailadress