To be honest, you are causing a bit of frustration as well. You keep saying it isn't working for you, yet you provide no details of what is going wrong.
Here is what I am going to ask you to do. Have the Guide open to follow along. Ignore for a moment that the UMIK-1 is not supposed to require a manual calibration.
- Boot up the laptop.
- Plug in the USB mic and HDMI cable before launching REW.
- Verify that the HDMI is your default output device (page 8).
- Verify that the UMIK-1 is your default input device (page 20).
- Verify the UMIK-1 level is set to 100 (page 23).
- Launch REW.
- Follow the instructions in "Step 5: REW Microphone Calibration" to the letter, again ignoring that the UMIK-1 should not require a calibration.
- If during Step 5, anything does not match what is supposed to happen according to the procedure, make a note of it (or better yet, take a screen shot).
At the end of Step 5, your mic should be working properly. By "working properly", I mean that REW should be producing a test tone at a level of approximately 80dB with an AVR master volume setting somewhere in the -10 to -20 range.
If the mic is still not working properly, then this is a test of your ability to accurately communicate why the procedure is not working. It is not out of the question that you could have a malfunctioning piece of equipment, either the mic or the laptop.