Access to the wifi comes with a shortcut in many phones. Bringing down the slider from the top in the android and bringing up the slider from the bottom in the iOS brings the wifi shortcut to the screen. You can also go into your phone’s settings and choose the wifi option by pressing the switch like button next to it. After that, it will ask you to join a network, which if is open would be joined without a password, otherwise asking for the user’s password for wifi access.