I am wondering what steps to take if i wanna change my roommates. Is there an online form or do i take talk to residence manager? Second semester just started and no way i can do another four months in this room without killing someone lool

If it is actually serious and affecting you, first talk to your CA then book an appointment with your RM, and if they believe it is necessary, they can move you if it is possible.

I was a CA for 2 years. Yup, it has to be pretty serious (e.g. an issue of personal safety, or anything that has to do with security services) or else you'll probably be stuck with them. If you are comfortable, talk to your roommates first and bring up your roommate contract if that's applicable, then go to your CA (who will direct you to your RM). Rez is jam-packed every year so room switches do not happen very often.