In the camera, you start by setting up the wifi settings. You will create a custom wi-fi connection to your camera and name it anything you want. For example, mine was named "Steve_6D". Once you are done creating the wifi channel, it will generate a passcode for you to use on your phone. Then you enable the wifi on the camera.
Now, go to your phone and to your phone settings menu that allows you to choose different wifi signals for your phone and look for the one you just created. Choose it and then your phone should prompt you for a password. Enter the password that the camera provided you.
Now, launch the EOS app on your phone and have it look for the camera. It should find it and then you can press a button to connect it. From there you should be able to liveview with it and change settings remotely.
Canon EOS 5D Mark III | Canon EOS 6D | Canon 85mm ƒ/1.8 | Canon 100mm ƒ/2.8 Macro | Canon 24-70L ƒ/2.8 II | Canon 17-40L ƒ/4 | Canon 70-200LII ƒ/2.8 | Canon 135L ƒ/2| 2 Canon 580EX II's | Canon 430EX II