[payment info problem]

I don't know where should I put for this question so if I put it wrong, plz forgive me.

I can't access to adult after adding the payment info because I can't see the adult option in my preference, general. Also, I have tried the age verification but it fails hundred times...

By this, I want to know why it fails to have an adult option after adding the successful payment info. by the way, I am using the latest version of SL viewer.