Topic: Wi-Fi Issue

Hi Guys
We are a small business here in Western Australia, we currently run Ruby with ubuntu on a micro server providing advertising to clients in shopping centres via Wi-Fi. The advertising is in the form of a scrolling text banner at the top of the screen with the centres logo acting as a hyperlink redirecting customers to a preset website. My programers have hit a snag with the apple devices. Apple have an auto login and auto joint  set to on as a default. The issue is with these on there is not search bar and no advertising, another business has managed to alter the auto login page to change the cancel button on the top right to a done button and then their client can use safari to login. We would like to do the same, or allow our advertising to operate with the auto login with the inclusion of a search bar. Any suggestions would be greatly appreciated.