BT-Wifi inconsistencies in procedure

Question

I've recently upgraded to Infinity 2 with a Home Hub 5.
In the HH interface I clicked "Find out more about BT Wifi", and was taken to
https://www.bt.com/wifi/secure/index.do?s_cid=con_FURL_btwifi
Clicking "Check on my status" doesn't accept my MyBT p/w ("Authentication failed: invalid user name or password") which is the password I think BT tells us to use with BTWifi. (btopenworld.com primary address)
However, entering my BTYahoo email p/w  takes me to
https://www.bt.com/wifi/secure/statuscheck.do
where I read that I'm opted out, but also gives me the option to opt out
It doesn't inspire confidence.
Why does the BTYahoo email password work rather than the the MyBT one?
Why does the system give me an option to opt out of something out of which I am already opted?

Answer 1

this was covered in a previous post but I tried to find it but failed.  it is misleading, I agree,  in that it asks for you BT iD and the intention is for you to have one sign in for everything being your BT ID.  New customers who are on new BT mail have one sign in which is their BT iD whichworks for email and MY BT
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