It is very surprising that this account is still login in your browser after 2 years. Account is still newbie so I will try to give you some suggestion. Don't try to change email etc because if you enter wrong password you will be automatic log out and you will not be able to recover this account forever.

First of all stake you Bitcoin address in this thread . If you don't know how to sign message you can take help from this Thread . Now you can use this account until you logout. After logout you can contact recovery team and they will ask for Sign message. This is the only reason I think will help you.