Logged in to lobby wifi on my iPhone 6 + running iOS 9.

Lobby wifi v slow. When checked in wanted to use full speed room wifi. However, when I wanted to put new log in details on the log in screen it won't now show the log in screen.

Clicked 'forget network' and it seemed to forget. However it does not. If you then select that network again, it just logs on using the last credentials. i.e. in this case the lobby wifi.

Anyone know how to make it forget properly so that when I select that network it offers the log in screen once more?

It's being a PITA trip IT wise - even GZ was demanding Captcha verification last night. In Thai characters!