Jackson made a campaign to destroy the second bank of the United States, of course the bank did not like this, so those who supported the bank did not support Jackson. He then set out to reduce the bank's economic power(to take the banks money; to leave the bank broke). He took away all federal funds that the bank was receiving, therefore completely taking all the banks money. The bank created a fake 'financial crisis' so the public would think they needed a bank to help them(with loans etc.), this strengthened the feud between Jackson and the Bank. This series of back and forth blows continued until finally, Jackson took down the bank.
I hope this helped, if you still don't understand you can just ask me!