Hi. You really need to take a back seat for a few weeks and just work around your hamster and not try to lift him too soon. He is still settling in and a few days is nowhere near long enough for a hamster to accept you or his new surroundings. Hamsters rely mostly on their smell and hearing rather than their eyesight, so you need to be aware of this. When a hamster throws itself onto it`s back or makes noise, it`s a warning and a hamster will bite if scared or stressed, so try not to provoke these actions and if he`s taking longer than usual to calm down, you can always take the lid off his cage and allow him to come out onto your knee on HIS terms. Taming should always be done with consideration of the hamsters environment and temperament.
Patience is always needed and rewards follow.