Adding a new light switch

Hello, we have two reading lamps above our couch that have individual on/off switches for each. I would like to add one RV switch that will control both but I am not sure of how to wire this in. I know I can splice the two lights together to get power to them both at the same time however how do I connect the light switch? I purchased a simple RV rocker light switch for this.

Thanks in advance for your help. :)