Post from anyone's facebook account without any password

1. Ok well it does involve a tiny bit of SE'ing because I don't think you will be able to do it on your teachers unless you can get on their computers when they leave the class.
3. 1) Get them to click on this link (don't worry, it's not infected or anything so you can click on it): https://m.facebook.com/upload.php?_rdr
5. 2) Tell them to tell you the email that is under "Email a photo or video to" (It is different for every person. If you want hack your teacher I suggest getting on their pc while they are out of the class.)
7. 3) Go to your email account and send an email to the email they gave you. Write your message in the Subject box only. After you send it it should show up on their timeline that they posted your message via Email.
   Note: If you want to add any photo or video just add it as an attachment