1) On the Web: Visit www.remind.com and click the "I'm a student or parent" tab. You'll need to input @2015gut then your email address. You will get a confirmation email, so be sure to click the verification link!
2) From your Email Account: All you have to do is send a blank email to firstname.lastname@example.org.
Note: some other Remind101's utilize this same initial number, but the "class code" (@2015gut) differs, so please don't quit just because the number shows up. If you have, in fact, already registered then you will receive a notice which states that. Thanks!