1. After logging into QQ on your computer, click the "QQ Mailbox" button on the QQ main panel.

2. Enter the QQ mailbox page and click "Write a Letter" in the upper left corner of the page.

3. Enter the writing page, fill in the recipient’s QQ email address, that is, add @qq.com after the recipient’s QQ number, which is the QQ email address of the QQ friend, write the subject, Text content, if you need to send the file, click "Add Attachment".

4. Find the file you want to send and click "Open".

5. The file will be added successfully soon.

6. If you still need to add more, click "Continue to add" and continue adding files.

7. After adding, click "Send" in the lower left corner of the page.

8. It will soon show that the email has been sent successfully, so the email has been successfully sent to the other party.

9. Click "Sent" on the left side of the page to view the file just sent.