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The USB cable should enter from the left, looking from the front of the camera.
There have been a non zero number of not correctly focused Polemasters in the wild (mine was fine), so as mentioned above, if your not seeing stars and your time / gain is correctly set, that would be the likely culprit.
A DOA test would be to plug it in inside and see if it white outs with the cap off and is black with it on.
I use Sharpcap v2.9x (which is free to for polar aligning, not like 3.x) to platesolve the pole.
I get the alignment close then swap over to the Polemaster software.
From memory I use around 280ms and 80 gain in Sharcap. If the sky is dark, then the stars should be easily visible.
You have an 8 degree field of view, so somewhere pointing close should be enough to get it platesolved. From there it is easy to twiddle the mount knobs to get very close.
Sigma oct should then be easy to pick out within the center of the field of view of the Polemaster software.
Then it is simply matching the model and the actual stars and your ready to go.
You will become an expert after a few tries.
If you have a so so mount, you will need to back off the alignment a little bit so the mount can guide out a little drift. It will improve your guiding.
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