Answer:
Using their front flippers.
Discussion:
They have two pairs of flippers that are used to help to propel these large animals with great agility through the water, with their bodies powered by their back flippers while the front flippers are used to steer them in the right direction. The skin on the bottom of their flippers is rough and knobbly which helps to prevent these enormous animals from slipping on the ice. Walruses have long tusks that are used for both fighting and dig into the ice when they are are pulling their heavy bodies out of the water.