I looked at my payment agreement and it says i've gotten into the brandon residence, but says nothing about who my roommate is. How do i find this out?

Should be somewhere on the site where you applied for residence.

Like JEFF_CHAN said, it's on you residence application.

Go here: https://residence.mcmaster.ca /Default.aspx

When you log-in, and check your application status, it'll say your name with your room and bed designation beside it (A, B, C, D) and your roommate(s) name(s) are there as well with their bed designations as well . There should also be a link to message them.

if they've allowed it, it should also show their email, allowing you to contact them

Originally Posted by djRAIN

if they've allowed it, it should also show their email, allowing you to contact them

Actually, there's no option showing you there email. There's just a "Message" button that goes directly to their email. It doesn't show their actual email though. I had to contact my roommate in first year to ask for her email.