The plan to reform the electoral college call for states to amend their election laws, it is the proposed national popular vote. So the electoral college calls for states to amend their election laws to reform the proposed national poular vote plan. So the answer in this question is for states to amend their election laws.
They both work together, but separation of powers divides the branches and checks an balances helps ensure that one branch doesn't get too powerful or powerful than the other.
