To play from Jriver through the airlens, you will use Jriver’s DLNA playback capabilities. I have not been able to figure out how to get it to play back DSD files reliably, but I have very few of them so no big deal.
When I want to play those back, I use Roon. In fact my preferred method of playback is through roon, but you asked about Jriver so here goes.
I am running Jriver 31. How you do this in prior versions is pretty much the same
I assume you already have your PC with Jriver and the airlens connected to the same local area network. If that is not the case you must first complete that step. Once this is the case you should be able to open the Jriver and see the Airlens in your list of DLNA clients. Here’s a screenshot of mine for reference.
Once you see that device listed, the next step is to configure a dlna server in your jriver media network settings. To do this click on the Tools menu in the top menu bar and then select options.
Once you have selected options you should see a screen with this menu on the left. Click on media network. This is where you will tell JRiver about the attributes of the Airlens
In the right section of the window you will see an line that says the following.
Click on that line to reveal the DLNA Servers window,
You may or may not see an item that says original format. It doesn’t really matter if you do or don’t because we will be creating a new one of those. Click on the Add… Button you see in the upper right side of that window to reveal the following screen.
Select the Audiophile 24-bit DAC (PS Audio, etc). You should then see something like this.
Make sure you click on the Audiophile dac as shown above on the screen and that the same Display name shows in the window pane below
In that window pane, click on Mode and select Specified output format only when necessary, as shown below.
Then click on Advanced to reveal the additional options shown.
Click on DSP Studio to reveal the following window.
Since the specifications state that the airlens is only capable of PCM up to 352.8 kHz as shown below we need to make some adjustments to the DSP settings.
In the following section of the DSP window scroll down until you can see all of the bitrates that are above 352.8 and set all of the ones that are higher than 352.8 to the 352.8 setting as shown below.
Then click the done button in the lower right corner of the DSP window.
You should now be back on the DLNA servers window as follows
Click the OK button in the bottom of that window.
And finally, click the OK button in the bottom right of the Options window
You should now be back on the main Jriver window.
Locate the Airlens in the upper left of that window as before
Right-click on AirLens to reveal the following menu options.
Move your mouse down to the Associate with DLNA server option and hover over that option. This will reveal the associate with XX (Audiophile 24-bit DAC). Click on that item to select it.
Now that you have the DLNA capabilities of the Airlens specified, you can try to play back some music.
Locate a non DSD file that you would like to playback. Right click on that file to reveal this menu of options.
From that menu move your mouse over the Send To option to reveal the different DLNA devices on your network that you could possibly play back to.
Move your mouse to the Play (Airlens) option which will reveal another menu of options shown below.
Select the play option that suits your fancy.
If you’ve managed to follow these convoluted steps perfectly, after a few seconds, you should begin to hear music coming from your system.
Good luck!!! You are going to need it. 
Assuming that you got that one file to play back properly, you can use the same method to playback playlists or albums too.
Finally to see what is playing and the list of what is to come, simply click on the Airlens in that list of devices in the upper left of the main Jriver window and you should see something like this.
@Paul I think you need to put me on the payroll after this one. 