The homework assigned by the teacher needs to be sent to her mailbox. How should I send it to her?

First of all, you should have a QQ mailbox, log in first, and then click on QQ mailbox (that is, the icon like an envelope should be known). After entering, click "Write Letter" on the left, fill in the email address "XXX homework" given to you by the teacher at the "Recipient", then click "Attachment" to select the file you want to upload, that is, the homework you want to hand in, and then click "Send".