Cancelling registration - someone please help!

Hey everyone, I’m transferring to Rutgers and I got accepted and will attend my star day in early June to pick classes. When is the last day I can cancel all of it and not attend the school without having to pay anything? I say this because I’m waiting for financial aid to process and I’m not sure if I wanna go to Rutgers yet. Sorry if this is a dumb question. Thank you for helping out.