The Tufts website says “Interested students may request the optional interview via the Application Checklist after the Common Application has been submitted.”
What is the application checklist and how exactly do I request an alumni interview?
Okay never mind, I figured out how to do it 
In case anybody wants to know: After you submit your application, Tufts will send you an email with a link and a PIN number. You can log into your account to check the status of your application and you can request an interview on that same page as well.
do you know when this email is sent? I sent in all of my materials yesterday and I haven’t gotten an email yet for my application checklist portal
You’ll get it a few days after you send your application, the day after is too early. You’ve probably gotten it by now actually lol