If you see the "Coming soon!" message when you try to select Phone & Tablet in your HD HERO2 camera's Wi-Fi settings menu, this means you need to update your HD HERO2 camera's software. If you're trying to use the GoPro App, you'll also need to make sure that your Wi-Fi BacPac's software is up-to-date.
Check out our this page for instructions on updating your HD HERO2 camera and Wi-Fi BacPac.
You also might want to check out our Getting Started with the GoPro App article to familiarize yourself with using the GoPro App.