Updated on December, and after some reported Passphrase issues:
 You are responsible for the security of your user account. Certain Services (including use of Opera’s forums) allow you to create a user account to access to certain Services.You are entirely responsible for maintaining the confidentiality of your user account and password. Additionally, you are also responsible for any and all activities that occur under your user account.
They will give no support about losing/forgeting the Passphrase - hidden information -.
Then, any suggestion about 2-steps authentication will not even be studied to be implemented.
It has a very close relation.