What is the 2 step procedure in firing a president

In the United States, impeachment is only the first of two stages, and conviction during the second stage requires "the concurrence of two thirds of the members present". Impeachment does not necessarily result in removal from office; it is only a legal statement of charges, parallel to an indictment in criminal law.

The President, Vice President and all civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.