<p>After seeing my waitlist letter and clicking "save and continue" at the bottom of the page, I was redirected to a page that asked for a code. I checked my Common App, Northwestern supplement and all of the e-mails they've sent me, but I still have no clue what I need to log in and get myself on the wait list.</p>
<p>Try again from the beginning. It worked for me: I opened the link, clicked save and continue, checked the box that I was accepting a spot on the waitlist, accepted the terms and conditions, and was promptly sent an email that everything went through.</p>