Can I Change my Major after Applying for University at Buffalo?

So I chose a biochem major for University at Buffalo but someone told me that it would decrease your chances of getting in. Can I call them up and ask them if I can change my major to undeclared? Please let me know, thank you!

My son changed his major after getting accepted from chem eng to computer science. Maybe wait until you are accepted.

I changed my major my emailing an admissions officer (i’m applying regular decision). You can also call admissions to do this as well!