Undergraduate students will apply for admission into the College of Arts & Sciences after successfully completing 26 hours of academic work (access A&S admissions information here). At the time of application, you will need to declare English as your major and talk to the Arts & Sciences advisor for English majors, Russell Friedman. Please visit the College of Arts & Sciences Advisement Directory for more information or to schedule an appointment. If you're an incoming freshman, you'll want to take a look at UNM's general admissions page.
Prospective graduate students need to follow the instructions on the graduate admissions page here.