Why the change????

They have changed their online banking... I spent nearly an hour this evening and two nights ago it was the same. Setting up new usernames, etc. Once logged in there is a request for profile numbers etc.. which is all well and good, but nowhere does it mention "previous" usernames and password and pin. So, for the second time I have been locked out of the account. Why the online banking set-up was changed in the first place I have no idea; it was fine as it was, and, I might add, much easier on the eye and so much easier pick up on where to go and which menu to go to. This one is dull and insipid. I am DONE!