The International Center is a separate office on campus that works with all international students and scholars at UCI (the Study Abroad Center only works with international students that are attending UCI through EAP). The International Center provides assistance with visa and immigration forms and is the office to contact if you have questions about these types of issues.
You will soon receive additional information from them about your arrival when you receive your I-20. Read all information carefully and follow any instructions given. Their contact information and hours are on their website. Upon arrival to UCI, you must also check-in with the International Center (building #113 on the UCI map).