You need to apply for teacher certification through the individual states' Department of Education. A directory of all of the states' certification offices is located on UD's teacher education web site. You need to contact the state certification offices, request an application packet for teacher certification, and complete the application process. Most states require initial applicants for teacher certification to pass required tests. However, the tests required and the passing scores vary from state to state.
Some states require tests that have been developed specifically within that state, i.e., New York.
A complete listing of test requirements by states can be found on UD's teacher education web site. You should begin taking these tests as early as possible in your senior year. It is sometimes possible to register on-line through this web site.