Transfer to new site doesn't go smootly

My login and password doesn’t work for the new forum on the singularsound site: I always have to click on “send email” button and using the link I receive is the only way to login on the new site. After logging off he doesn’t recognises my login/password any more…
Shall I create a new account? But then I will lose all my posts…

@Forum_Admin can you help this user, please?