Regarding how to set the Wifi, you can get a cheap wifi dongle such as EDIMAX EW-7811UN (or any other listed in this thread Wifi connectivity - #46 by jon).
Setting it up is detailed here: WiFi - MOD Wiki
Then, you can connect your phone onto the unit and open a browser (I guess Safari for you) pointing to the correct device (moddwarf.local should work, but otherwise you need to use an app like service scanner to find out your dwarf’s IP address). That should show you your device’s web interface.
And this has nothing to do with the Desktop app which turns your PC into a virtual mod device, rather than managing a hardware device like the dwarf.