I'm very surprised he's even replying and I don't expect he will do so for long but my advice is that while he is responding then do exactly what he ask's you to do and if it still doesn't work then send it back or have them come and get it working. You shouldn't have to make the machine work and just crashing it into the side shouldn't break the electrical side of the machine (or even the mechanical side in normal circumstances). The worst it should do is require a shutdown and reset of the drives or at the very worst a PC restart.

Don't mess around in Mach3 because you can easily wipe out important settings. For instance, the Reset you show isn't a reset like you think, what you are actually doing is Reselecting the external Motion controller device, which in your case will be UC100, which is an external USB device.

If you still don't get any joy from him and he doesn't get you working or you don't or can't return it, then come back and I will talk you thru getting it working but until then I wouldn't touch it or change any settings unless told to do so by the supplier.