How to set SMS password for vivo smartphone?

There are two ways to set the SMS password:

1. Enter the short message conversation list interface, select the contact to be encrypted and press to pop up the dialog box, select "Encrypt Conversation" to pop up the password input dialog box, and enter a new password.

2. After entering the SMS interface, press the left function key, select "Settings" to enter, and click the "Set Password" button.

3. If you have previously set a password for the email, you can only enter a new password after clicking the Set Password button. After modification, the original message password will also be changed to a new password.