2. Enter the Settings and Options menu. You can find this menu in the upper right corner or the upper left corner of the email interface.
3. In the Settings and Options menu, look for "Signature", "Personal Settings" or similar options.
4. After entering the signature setting page, you can create, edit and modify existing signatures.
5. In the signature editing box, enter the personalized signature you want to set, namely "classmate".
6. You can adjust the font, color, size and other formats of the signature according to your needs. Confirm and save the signature settings.