what does anthony manage with the crowd and how he manage to do the change?

Mark Anthony has the power of speech over the people. Remember that the townspeople where very guable and were easily persuaded to belive anything that was told to them. He told the people that Ceaser left a will, and in the will he left 75 drachmas and the beautiful orchards for each person in rome. The people belived him and then quickly turned their actions on the conspiritors to avenge ceasar's death.