By gently moving the dish. Seeing as you're having all these problems I'd first check your cable connections are correct, even doing them again to make sure.
It just takes time, and patience, to gently nudge the dish to get a signal.
What transponder are you using to locate the signal ? Try 10788 V 22000 they are BBC 1 FTA channels.
Why are you trying to get Astra 2, 28.2E with your receiver? Your receiver is patchable and you would get far more viewing choice from Astra 1, 19.2E or Thor 1W, including live football, films and entertainment channels.
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