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https://www.youtube.com/watch?v=qpHQdSvLQj8
Pretty good non-verbal video that shows you everything. They are adjusting by the yellow marks at the bottom of the cassete joint, there should also be a pair at the top with one behind a clear plastic window that would be more easily seen (though maybe harder to get on video) once the wheel was in the bike.
Thanks. It's a Shimano SG-C6001 8-Speed hub. Good to know about the rapid fire shifter. Yes, I realise I've never even taken the rear wheel out yet. Definitely need to get more familiar with doing the basic mechanics on it.