To reach this point, you should have just just connected your audio interface and all of your audio gear and instruments, and started the audio setup wizard as explained in this help article.
You should now be looking at Step 2 of the audio setup wizard. Click the Audio Input Device list box (pictured below with arrow).
You see the list box open, and you need to scroll down in the list box options until you see the option for "UMC ASIO Driver - ASIO" (pictured below with arrow). This is the software driver for your UMC204HD audio interface. Click this option in the list to select it.
You will now see the JamKazam app test your audio interface settings for 5 seconds, and you will see "Test Results" reported on the right side of the screen (pictured below). You should see a reported latency value of approximately 4ms (i.e. 4 milliseconds, which is four one-thousandths of a second), which is what the Windows system is reporting back to the JamKazam app. Sometimes this value is fairly accurate, and sometimes less so - more on that in a minute.
If your latency is about 4ms, you can skip past this next step, as you do not need to adjust your driver settings. If your reported latency value is not about 4ms, but is noticeably higher, please click the orange ASIO Settings button, and you will see the Behringer dialog box that controls the Behringer software driver and audio interface settings for your audio interface (pictured below). Click the Buffer Settings tab at the top of this dialog box, and then look at the value displayed in the Preferred ASIO Buffer Size list box
The list box value should be set to "8 samples". If it is not, then click open the list box, and click the option to select "8 samples". Then click the "X" at the top right corner to close the dialog box. You are now back to viewing Step 2 of the audio setup wizard. Click the orange "Resync" button (pictured below with arrow). This will cause your new settings to take effect. No look at the Test Results section of the screen again. Your reported latency should be approximately 4ms.
Please note that if either the Latency or I/O scores under Test Results are displayed in dark red, this means a test has failed, and the orange Next button in the bottom right corner of the wizard will be disabled. If this happens to you, simply click the orange Resync button (pictured below with arrow) to make the JamKazam test run again. Once in a while, an audio interface test will fail, but if you just run it again, it will often pass.
At this point, we recommend that you verify with your own ears that the audio interface settings you have chosen are working well. To do this, put on the headphones connected to your audio interface and grab your instrument and/or mic. Play your instrument and/or sing - do what you're going to actually do musically - and listen to how the audio sounds in your headphones. You should hear the audio clearly, and it should sound very good/clean. You should not hear any bad audio artifacts - like crackling, snapping, dropouts, or other audio glitches.
If you can't hear anything at all, you have something set up wrong. Check that your gain knobs are turned up on your audio inputs. Check that any on/off switches on your microphones or instruments are set to on. Check that your headphone volume knob is turned up. Generally fiddle with all of these kinds of things to make sure everything is connected properly, turned on, and turned up. You can also check that you don't have a microphone or instrument port set to "line" level.
Please note that you may only hear your audio in one headphone, not in stereo in both headphones, at this point in the setup wizard. Don't worry about this. We'll get this sorted out in Step 3 next.
If your audio sounds clean and good, then you are done with Step 2 of the wizard. Please click the orange Next button (pictured below with arrow) to move forward to Step 3 of the wizard, and then click here for the Step 3 help doc instructions.