1. First ask the teacher which email address to send.

2. Take an ordinary mailbox as an example, find the mailbox logo in the login interface, and click to enter the mailbox interface.

3. Select the option of writing in the mail interface to enter the writing interface.

4. Find the recipient option in the letter-writing interface, fill in the teacher's email address behind the recipient, and write "thesis" in the subject box. Write the content in the text.

5. Click Send.