The UC Irvine Office of Admissions and Relations with Schools maintains an excellent website with instructions on how to apply: www.admissions.uci.edu/applicants/apply.html
It addresses freshman and transfer students, lists important dates and deadlines, provides answers to frequently asked questions, suggests useful contacts, and has information for international applicants.
Make sure you are aware of the posted deadlines, know the major of your choice, and prepare your personal statement. The University of California web site offers useful advice on how to prepare the two essays that form your personal statement.
Should you have any questions about the undergraduate application process, please see the list of useful contacts for the right office, or contact our Student Affairs Office at 949-824-5156.