Just plug the nimh in, select nimh charge, set current to match the battery capacity (3000mah=3A, 4200mah=4.2A) and press start. Manual setting will charge the pack at the current you set, auto setting varies the current which is not the best way to charge nimhs. Just let the cells cool down after running before charging them.
A couple of suggestions though if you are worried about damaging them Delta peak as standard is set to 7mV, you might want to drop it to 5mV and you might want to limit the capacity cutoff to around the capacity of the cells. Personally mine is set to default manual charge and never had a problem as I never ran any of the Intellect cells that were the big problem a few years ago.
Cells are much more durable now the manufacturers aren't trying to get every last bit of performance out of them. Personally I'm running 3700mah cells, charging them at 5A as it gets more performance out of them but it does shorten their life. They get balanced on a discharger every month and they don't really need it based on the readings.
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