You can reset your password using this link: account.dyn.com/resetpass/ please note that if you are logged into devices using your password and not a client key and reset your password, you will need to relog into all of your update clients.
Nobody and nothing can retrieve your password. At good secure systems your password is never ever being stored, even not encrypted. Just a hash total of your password is being stored which is enough to validate your password, but not retrieve it. The only way is to create a new password at https://account.dyn.com/resetpass/ as Mike Taylor said.
If you really want to retrieve passwords in the future, you are to use one of these many password management tools.