How to set a WhatsApp secret code?
Start by locking a few WhatsApp conversations. Go to the conversation you wish to lock, press the three dots in the upper right corner, and select the "Lock Chat" option.
Take these actions once certain conversations have been locked:
1. Launch WhatsApp, then navigate to the Locked Chats folder.
2. Now choose Chat lock settings by tapping the three dots in the upper right corner.
3. Choose the option for "secret code."
4. Enter your preferred code now, or the one you can remember.
5. Reenter the code after tapping Next.
6. To set the code, tap Done.