There are three ways to get back into your account. Pick the one that fits you.
Option 1: Reset it yourself
Go to stileapp.com
Type in your school email address — check for typos!
If Stile finds your account, it will take you to the password page
Click the reset password button and follow the steps
If Stile doesn't recognise your email, ask your teacher which email address is on your account. They can see it on their Students page.
Option 2: Ask your teacher for a temporary password
Your teacher can create a temporary password for you. Ask them to set one for you during class. Use it to log in with your email, and then set a new password.
Option 3: Your school manages your login
If you log in through your school's own login page, Stile doesn't control your password. Talk to your school's IT person for help.
Not sure which option applies to you? Ask your teacher!