Change password on sub-account

A family member wants to change their password on a sub-account. I'm the principal account holder, so do I have to do that or can it be done by the sub-account user? We can't find a way to do it from the sub-account.

On my BT account it is a case of login to the secondary account and select manage services, under that is a list:

Review account contact details>
Manage directory listing>
Change password or secret Q&A>
Manage marketing subscriptions from BT>
Connection settings>

Select Change password and it is easy.


Yours may be a residential account - but the capabilities will be there.