If one pad is rubbing you need to put more tension on the vee arm on that side. They'll be a bolt that you screw in putting more tension on the arm. to set it up you just have to put the pad on the rim straightish, pull the lever and tighten the pad up. Also, you have to try and get the arms to be as parallel as possible to the rim (when the brake is pulled) to make it feel and work best.