Contrarily to tacking, jibbing means turning through the wind. When sailing at beam reach, firstly you need to bear away to go to broad reach and then into the wind. During this process, you must change the sail position and your feet position, which should be placed port side and starboard side while you are facing the nose of the board and the sail is across. The board will go through the wind.
The second step of the maneuver is to let go of your hand at the back of the boom and grip the mast, so both of your hands are now on it. The boom will go over the board nose, indicating the wind direction.
In this position, tilt the mast to the right or the left so you can steer the board to either side. If you tilt it to the right, the board will steer to the left; if you tilt it to the left, the board will steer to the right. This will make steering easier.
Finally, for the third step of jibbing you must let go of the hand you had on the mast and grip the boom on the opposite side that you had it before. Then, start luffing while slowly tilting the clew closer to the water, with the sail across the board and your feet at port and starboard side. You will need to change the sail and your feet position while luffing until reaching the desired course, broad reach and/or beam reach.