Undeclared Major

Hi,
So I applied to Lehigh University for their college of arts and sciences with a major in Economics. I was waitlisted there and eventually got off the waitlist, but they put me in an undeclared major. I accepted their offer, but I was wondering when I would be able to choose my major? Can I do it during my first semester there?

https://cbeundergrad.lehigh.edu/advising/major-declaration