You can apply to the Honors College in the NinerScholars Portal. All applicants will be considered for the University Honors Program in the Honors College, which is open to students with any major. Additionally, applicants will be considered for the Arts + Architecture Honors Program (AAHP), open to any students with a major in the College of Arts + Architecture, or the Business Honors Program (BHP), open to any students with a major in the College of Business.
"But, which honors program should I join?"
Well, that depends in part on your major and when you are trying to join. Certain programs are only open to Freshmen and Sophomores, while other programs are only open to Juniors and Seniors. So, when you want to join matters.