Since you refer to installing a USB driver I infer from this that you are using a Windows computer. We need to know what version of OS and what player software and version(s) to provide best quality support.
For USB playback you need to go into the Windows sound system properties and select the PS Audio USB device.
For network playback through the Bridge you need to have media server software running on the computer and you also need some form of UPnP controller. The UPnP controller can be on the computer or another networked device such as a tablet. The UPnP controller accesses the media server to determine what files are available for playback and then accesses the Bridge to tell it what files to request from the media server for playback. This may sound convoluted but this is all done transparently - you only need to open the UPnP controller and tell it which server and renderer to use. Once this is done you add the desired files to the playlist and select play - the controller takes care of all the rest.
Most people here seem to prefer J River Media Center for their server, although a few of us prefer Foobar2000. Foobar2000 has the advantage of being free but is not as pretty as J River. Both can be rather fiddly to set up but once set up both are stable and generally easy ro use. At least I find Foobar2000 easy to use, I have yet to try J River. Another media server that is used by a few here, is free and is very well respected is Minim server. It has the advantage of being able to run on many platforms…
Foobar2000 can also be set up to operate as a player and stream its output directly to the Bridge. This is done with thr foo.out.upnp plugin. It can be remote controlled from an iPad with MonkeyMote. There are also remote apps for Android devices but I have little experience with these apps.
Feel free to ask for further help - we are happy to help get your system up and running. Of course, as I led with, computer and network system details are very helpful in our quest for assistance.