Hi Stéphane
1. First, you "connect" a Manual Rotator, which is provided by NINA. See the Rotator.jpg below
2. Second, in the Framing panel when choosing your target, make sure you select the target from "File" at the top, then Load the image below. NINA will platesolve it. See the second image.
In this second image, it's not highlighted as I have no equipment selected, but the button that says "Slew and Centre" (it's greyed out), click that and select "Slew, Centre and Rotate".
NINA will slew to the target, platesolve, then pop up a window to tell you how much to turn your train clockwise or anticlockwise. You keep taking exposures until you get it. I was within half a degree last night and it took about 5-6 exposures.
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