Yea, Jeff is correct you don't need an "App" to control your B2, Just a web browser (safari). Open Safari and in the top bar where you see the "https://......." stuff type in the IP number the Brennan is displaying on boot up (assuming you have connected it up to your house Router/WiFi), it will probably look something like IP=192.168.XXX.YYY , where X may be a single digit (1 or 0 probably) and Y is probably two digits.
This will open the B2's web page from where you can drive your B2.
Fred