Go to the Nokia account sign in page either from Settings > email+accounts > add an account or Settings > Nokia account, and select the link I don’t know my password. Enter either of your contact information associated with your account, so that Nokia can send you a password reset link. Check your mail box or the messages on your phone, depending upon the contact information given earlier for the password reset link. Select the link to reset the password and reclaim your account.
You can also recover your Nokia Account password by accessing the link account.nokia.com with a Web browser.