When a reaction is endothermic just place a little triangle symbolizing heat on the reactants side and treat it just like a reactant. So if we increased that reactant (heat) then it would drive the equilibrium to the right. Now think of an exothermic reaction, place the triangle on the right as a product, if we were to add heat to the reaction mixture we would be adding a product and driving the reaction back to the left. What if we took heat out of the reaction mixture and the reaction is exomthermic, we would then be removing a product and pushing the equilibrium to the right. If this doesn't make sense just say so and I will try and find another way to explain but you should try writing this out to see if it makes sense.
