If you're having trouble getting the app to run on your phone, open CMD (Windows+R -> cmd) and navigate to your android directory with
cd C:\Program Files (x86)\Android\android-sdk\platform-tools
then check to see what devices are connected with
It will respond with "List of devices attached" and you should see your phone below. If not, then you either need to install your phone USB drivers or download a program called Wifi ADB (which may be rooted phones only). Once you've run that, it'll tell you the line you need to type into cmd which should be something like
adb connect 192.168.1.7
Run adb devices again and see if it worked. You can only build and run if there is only one device connected at a time.