How do you write an email to a supervisor?

Some, but not all, supervisors use their e-mail address in the format of [username] @ (no spaces). If the username has a dash or space in it that character should be replaced with a period in the e-mail address. Alternatively, you may message them on their message board with your e-mail address or ask for their e-mail address if they are comfortable sharing it. Message boards are in the format of[username]