How do i change the windshield wiper arm on my truck?

i have a 1990 chevy 1500 pick up truck and don't know how to change a broken wiper arm assy.How do i change the windshield wiper arm on my truck?
The end of the arm, where it bolts to the motor, is covered by a metal piece. You will have to remove that, then it is as simple as taking off a nut, removing the old arm, and reversing the procedure. Good luck with it.How do i change the windshield wiper arm on my truck?
Go to a auto parts store and ask a guy over there. They will help.