How should I record my banking and financial accounts password login?

Technically and legally, it is illegal to access/dispose of the deceased properties without proper authority. Either a grant of probate or letter of administration is needed to administer the estate.

Once u get the necessary grant, it will be easy to close or settle the accounts.

To work around for bank accounts, a joint account will solve it. Add the name of the trusted next of kin to his/her bank account.

Regardless, a proper Will should be drafted up to ensure his/her properties will be disposed according to his/her intention. And to ensure someone trusted will administer the properties in accordance.

I would probably need to know more details on what is your exact situation to advice accordingly.