hello @suo111111
if you not know well your password, go in the site (Help) (Customer Service) (Login/Password) (I've lost my password)
after made this :
in the program go (Settings) (Advanced) clic mouse right on (Synchronize with server)
and (register again) here then you use the name account (suo111111) or (v21139293) if the first give problem.
edit : additionnal informations about install.
for the next time, when you install, normally you see one option (i have already one account).
have a nice day.