Please help me understand and solve this using free body diagrams and the method of joints.

The Howe truss shown supports a roof loaded by the pressure of a wind blowing in the direction marked $W.$ The weather side of the roof is subjected to positive pressure while the lee side is subjected to negative pressure due to the suction effect of the wind blowing over the roof. The corresponding forces transmitted to the joints of the truss by the roof are shown on the figure below. Use the Method of Joints to determine the force in members $EJ,EH,$ and $DE.$