G'day Anonymous, Thank you for your question. He can't. The Congress makes law and the President gives it his assent. He can veto laws but Congress can override him in a supermajority vote. Regards

Actually it is quite simple - It is called a presidential executive order. From Wikipedia... An executive order in the United States is a directive issued by the President, the head of the executive branch of the federal government. In other countries, similar edicts may be known as decrees, or orders-in-council. Executive orders may also be issued at the state level by a state's Governor. U.S. Presidents have issued executive orders since 1789, usually to help direct the operation of executive officers. Some orders do have the force of law when made in pursuance of certain Acts of Congress, when those acts give the President discretionary powers. Critics have accused presidents of abusing executive orders, of using them to make laws without Congressional approval, and of moving existing laws away from their original mandates.[1] Large policy changes with wide-ranging effects have been effected through executive order, including the integration of the armed forces under Harry Truman and the desegregation of public schools under Dwight D. Eisenhower. One extreme example of an executive order is Executive Order 9066, where Franklin D. Roosevelt delegated military authority to remove all people (used to target specifically Japanese Americans and German Americans) in a military zone. Source: http://en.wikipedia.org/wiki/Executive_order_(United_States)

The President doesn't make law, his job is to enforce it. He CAN make policy through different means, but that doesn't make it law. The laws come from Congress.

not sure how but since hes president he can make them

He can't. He can pass some EO's but those are limited in scope and can be challenged.